3 * Lodash <https://lodash.com/>
4 * Copyright OpenJS Foundation and other contributors <https://openjsf.org/>
5 * Released under MIT license <https://lodash.com/license>
6 * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
7 * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
11 /** Used as a safe reference for `undefined` in pre-ES5 environments. */
14 /** Used as the semantic version number. */
15 var VERSION = '4.17.20';
17 /** Used as the size to enable large array optimizations. */
18 var LARGE_ARRAY_SIZE = 200;
20 /** Error message constants. */
21 var CORE_ERROR_TEXT = 'Unsupported core-js use. Try https://npms.io/search?q=ponyfill.',
22 FUNC_ERROR_TEXT = 'Expected a function';
24 /** Used to stand-in for `undefined` hash values. */
25 var HASH_UNDEFINED = '__lodash_hash_undefined__';
27 /** Used as the maximum memoize cache size. */
28 var MAX_MEMOIZE_SIZE = 500;
30 /** Used as the internal argument placeholder. */
31 var PLACEHOLDER = '__lodash_placeholder__';
33 /** Used to compose bitmasks for cloning. */
34 var CLONE_DEEP_FLAG = 1,
36 CLONE_SYMBOLS_FLAG = 4;
38 /** Used to compose bitmasks for value comparisons. */
39 var COMPARE_PARTIAL_FLAG = 1,
40 COMPARE_UNORDERED_FLAG = 2;
42 /** Used to compose bitmasks for function metadata. */
43 var WRAP_BIND_FLAG = 1,
44 WRAP_BIND_KEY_FLAG = 2,
45 WRAP_CURRY_BOUND_FLAG = 4,
47 WRAP_CURRY_RIGHT_FLAG = 16,
48 WRAP_PARTIAL_FLAG = 32,
49 WRAP_PARTIAL_RIGHT_FLAG = 64,
51 WRAP_REARG_FLAG = 256,
54 /** Used as default options for `_.truncate`. */
55 var DEFAULT_TRUNC_LENGTH = 30,
56 DEFAULT_TRUNC_OMISSION = '...';
58 /** Used to detect hot functions by number of calls within a span of milliseconds. */
62 /** Used to indicate the type of lazy iteratees. */
63 var LAZY_FILTER_FLAG = 1,
67 /** Used as references for various `Number` constants. */
69 MAX_SAFE_INTEGER = 9007199254740991,
70 MAX_INTEGER = 1.7976931348623157e+308,
73 /** Used as references for the maximum length and index of an array. */
74 var MAX_ARRAY_LENGTH = 4294967295,
75 MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1,
76 HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;
78 /** Used to associate wrap methods with their bit flags. */
80 ['ary', WRAP_ARY_FLAG],
81 ['bind', WRAP_BIND_FLAG],
82 ['bindKey', WRAP_BIND_KEY_FLAG],
83 ['curry', WRAP_CURRY_FLAG],
84 ['curryRight', WRAP_CURRY_RIGHT_FLAG],
85 ['flip', WRAP_FLIP_FLAG],
86 ['partial', WRAP_PARTIAL_FLAG],
87 ['partialRight', WRAP_PARTIAL_RIGHT_FLAG],
88 ['rearg', WRAP_REARG_FLAG]
91 /** `Object#toString` result references. */
92 var argsTag = '[object Arguments]',
93 arrayTag = '[object Array]',
94 asyncTag = '[object AsyncFunction]',
95 boolTag = '[object Boolean]',
96 dateTag = '[object Date]',
97 domExcTag = '[object DOMException]',
98 errorTag = '[object Error]',
99 funcTag = '[object Function]',
100 genTag = '[object GeneratorFunction]',
101 mapTag = '[object Map]',
102 numberTag = '[object Number]',
103 nullTag = '[object Null]',
104 objectTag = '[object Object]',
105 promiseTag = '[object Promise]',
106 proxyTag = '[object Proxy]',
107 regexpTag = '[object RegExp]',
108 setTag = '[object Set]',
109 stringTag = '[object String]',
110 symbolTag = '[object Symbol]',
111 undefinedTag = '[object Undefined]',
112 weakMapTag = '[object WeakMap]',
113 weakSetTag = '[object WeakSet]';
115 var arrayBufferTag = '[object ArrayBuffer]',
116 dataViewTag = '[object DataView]',
117 float32Tag = '[object Float32Array]',
118 float64Tag = '[object Float64Array]',
119 int8Tag = '[object Int8Array]',
120 int16Tag = '[object Int16Array]',
121 int32Tag = '[object Int32Array]',
122 uint8Tag = '[object Uint8Array]',
123 uint8ClampedTag = '[object Uint8ClampedArray]',
124 uint16Tag = '[object Uint16Array]',
125 uint32Tag = '[object Uint32Array]';
127 /** Used to match empty string literals in compiled template source. */
128 var reEmptyStringLeading = /\b__p \+= '';/g,
129 reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
130 reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
132 /** Used to match HTML entities and HTML characters. */
133 var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g,
134 reUnescapedHtml = /[&<>"']/g,
135 reHasEscapedHtml = RegExp(reEscapedHtml.source),
136 reHasUnescapedHtml = RegExp(reUnescapedHtml.source);
138 /** Used to match template delimiters. */
139 var reEscape = /<%-([\s\S]+?)%>/g,
140 reEvaluate = /<%([\s\S]+?)%>/g,
141 reInterpolate = /<%=([\s\S]+?)%>/g;
143 /** Used to match property names within property paths. */
144 var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
145 reIsPlainProp = /^\w*$/,
146 rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|$))/g;
149 * Used to match `RegExp`
150 * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).
152 var reRegExpChar = /[\\^$.*+?()[\]{}|]/g,
153 reHasRegExpChar = RegExp(reRegExpChar.source);
155 /** Used to match leading and trailing whitespace. */
156 var reTrim = /^\s+|\s+$/g,
157 reTrimStart = /^\s+/,
160 /** Used to match wrap detail comments. */
161 var reWrapComment = /\{(?:\n\/\* \[wrapped with .+\] \*\/)?\n?/,
162 reWrapDetails = /\{\n\/\* \[wrapped with (.+)\] \*/,
163 reSplitDetails = /,? & /;
165 /** Used to match words composed of alphanumeric characters. */
166 var reAsciiWord = /[^\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\x7f]+/g;
168 /** Used to match backslashes in property paths. */
169 var reEscapeChar = /\\(\\)?/g;
173 * [ES template delimiters](http://ecma-international.org/ecma-262/7.0/#sec-template-literal-lexical-components).
175 var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
177 /** Used to match `RegExp` flags from their coerced string values. */
178 var reFlags = /\w*$/;
180 /** Used to detect bad signed hexadecimal string values. */
181 var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
183 /** Used to detect binary string values. */
184 var reIsBinary = /^0b[01]+$/i;
186 /** Used to detect host constructors (Safari). */
187 var reIsHostCtor = /^\[object .+?Constructor\]$/;
189 /** Used to detect octal string values. */
190 var reIsOctal = /^0o[0-7]+$/i;
192 /** Used to detect unsigned integer values. */
193 var reIsUint = /^(?:0|[1-9]\d*)$/;
195 /** Used to match Latin Unicode letters (excluding mathematical operators). */
196 var reLatin = /[\xc0-\xd6\xd8-\xf6\xf8-\xff\u0100-\u017f]/g;
198 /** Used to ensure capturing order of template delimiters. */
199 var reNoMatch = /($^)/;
201 /** Used to match unescaped characters in compiled string literals. */
202 var reUnescapedString = /['\n\r\u2028\u2029\\]/g;
204 /** Used to compose unicode character classes. */
205 var rsAstralRange = '\\ud800-\\udfff',
206 rsComboMarksRange = '\\u0300-\\u036f',
207 reComboHalfMarksRange = '\\ufe20-\\ufe2f',
208 rsComboSymbolsRange = '\\u20d0-\\u20ff',
209 rsComboRange = rsComboMarksRange + reComboHalfMarksRange + rsComboSymbolsRange,
210 rsDingbatRange = '\\u2700-\\u27bf',
211 rsLowerRange = 'a-z\\xdf-\\xf6\\xf8-\\xff',
212 rsMathOpRange = '\\xac\\xb1\\xd7\\xf7',
213 rsNonCharRange = '\\x00-\\x2f\\x3a-\\x40\\x5b-\\x60\\x7b-\\xbf',
214 rsPunctuationRange = '\\u2000-\\u206f',
215 rsSpaceRange = ' \\t\\x0b\\f\\xa0\\ufeff\\n\\r\\u2028\\u2029\\u1680\\u180e\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000',
216 rsUpperRange = 'A-Z\\xc0-\\xd6\\xd8-\\xde',
217 rsVarRange = '\\ufe0e\\ufe0f',
218 rsBreakRange = rsMathOpRange + rsNonCharRange + rsPunctuationRange + rsSpaceRange;
220 /** Used to compose unicode capture groups. */
221 var rsApos = "['\u2019]",
222 rsAstral = '[' + rsAstralRange + ']',
223 rsBreak = '[' + rsBreakRange + ']',
224 rsCombo = '[' + rsComboRange + ']',
226 rsDingbat = '[' + rsDingbatRange + ']',
227 rsLower = '[' + rsLowerRange + ']',
228 rsMisc = '[^' + rsAstralRange + rsBreakRange + rsDigits + rsDingbatRange + rsLowerRange + rsUpperRange + ']',
229 rsFitz = '\\ud83c[\\udffb-\\udfff]',
230 rsModifier = '(?:' + rsCombo + '|' + rsFitz + ')',
231 rsNonAstral = '[^' + rsAstralRange + ']',
232 rsRegional = '(?:\\ud83c[\\udde6-\\uddff]){2}',
233 rsSurrPair = '[\\ud800-\\udbff][\\udc00-\\udfff]',
234 rsUpper = '[' + rsUpperRange + ']',
237 /** Used to compose unicode regexes. */
238 var rsMiscLower = '(?:' + rsLower + '|' + rsMisc + ')',
239 rsMiscUpper = '(?:' + rsUpper + '|' + rsMisc + ')',
240 rsOptContrLower = '(?:' + rsApos + '(?:d|ll|m|re|s|t|ve))?',
241 rsOptContrUpper = '(?:' + rsApos + '(?:D|LL|M|RE|S|T|VE))?',
242 reOptMod = rsModifier + '?',
243 rsOptVar = '[' + rsVarRange + ']?',
244 rsOptJoin = '(?:' + rsZWJ + '(?:' + [rsNonAstral, rsRegional, rsSurrPair].join('|') + ')' + rsOptVar + reOptMod + ')*',
245 rsOrdLower = '\\d*(?:1st|2nd|3rd|(?![123])\\dth)(?=\\b|[A-Z_])',
246 rsOrdUpper = '\\d*(?:1ST|2ND|3RD|(?![123])\\dTH)(?=\\b|[a-z_])',
247 rsSeq = rsOptVar + reOptMod + rsOptJoin,
248 rsEmoji = '(?:' + [rsDingbat, rsRegional, rsSurrPair].join('|') + ')' + rsSeq,
249 rsSymbol = '(?:' + [rsNonAstral + rsCombo + '?', rsCombo, rsRegional, rsSurrPair, rsAstral].join('|') + ')';
251 /** Used to match apostrophes. */
252 var reApos = RegExp(rsApos, 'g');
255 * Used to match [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks) and
256 * [combining diacritical marks for symbols](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks_for_Symbols).
258 var reComboMark = RegExp(rsCombo, 'g');
260 /** Used to match [string symbols](https://mathiasbynens.be/notes/javascript-unicode). */
261 var reUnicode = RegExp(rsFitz + '(?=' + rsFitz + ')|' + rsSymbol + rsSeq, 'g');
263 /** Used to match complex or compound words. */
264 var reUnicodeWord = RegExp([
265 rsUpper + '?' + rsLower + '+' + rsOptContrLower + '(?=' + [rsBreak, rsUpper, '$'].join('|') + ')',
266 rsMiscUpper + '+' + rsOptContrUpper + '(?=' + [rsBreak, rsUpper + rsMiscLower, '$'].join('|') + ')',
267 rsUpper + '?' + rsMiscLower + '+' + rsOptContrLower,
268 rsUpper + '+' + rsOptContrUpper,
275 /** Used to detect strings with [zero-width joiners or code points from the astral planes](http://eev.ee/blog/2015/09/12/dark-corners-of-unicode/). */
276 var reHasUnicode = RegExp('[' + rsZWJ + rsAstralRange + rsComboRange + rsVarRange + ']');
278 /** Used to detect strings that need a more robust regexp to match words. */
279 var reHasUnicodeWord = /[a-z][A-Z]|[A-Z]{2}[a-z]|[0-9][a-zA-Z]|[a-zA-Z][0-9]|[^a-zA-Z0-9 ]/;
281 /** Used to assign default `context` object properties. */
283 'Array', 'Buffer', 'DataView', 'Date', 'Error', 'Float32Array', 'Float64Array',
284 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Map', 'Math', 'Object',
285 'Promise', 'RegExp', 'Set', 'String', 'Symbol', 'TypeError', 'Uint8Array',
286 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap',
287 '_', 'clearTimeout', 'isFinite', 'parseInt', 'setTimeout'
290 /** Used to make template sourceURLs easier to identify. */
291 var templateCounter = -1;
293 /** Used to identify `toStringTag` values of typed arrays. */
294 var typedArrayTags = {};
295 typedArrayTags[float32Tag] = typedArrayTags[float64Tag] =
296 typedArrayTags[int8Tag] = typedArrayTags[int16Tag] =
297 typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =
298 typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =
299 typedArrayTags[uint32Tag] = true;
300 typedArrayTags[argsTag] = typedArrayTags[arrayTag] =
301 typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =
302 typedArrayTags[dataViewTag] = typedArrayTags[dateTag] =
303 typedArrayTags[errorTag] = typedArrayTags[funcTag] =
304 typedArrayTags[mapTag] = typedArrayTags[numberTag] =
305 typedArrayTags[objectTag] = typedArrayTags[regexpTag] =
306 typedArrayTags[setTag] = typedArrayTags[stringTag] =
307 typedArrayTags[weakMapTag] = false;
309 /** Used to identify `toStringTag` values supported by `_.clone`. */
310 var cloneableTags = {};
311 cloneableTags[argsTag] = cloneableTags[arrayTag] =
312 cloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =
313 cloneableTags[boolTag] = cloneableTags[dateTag] =
314 cloneableTags[float32Tag] = cloneableTags[float64Tag] =
315 cloneableTags[int8Tag] = cloneableTags[int16Tag] =
316 cloneableTags[int32Tag] = cloneableTags[mapTag] =
317 cloneableTags[numberTag] = cloneableTags[objectTag] =
318 cloneableTags[regexpTag] = cloneableTags[setTag] =
319 cloneableTags[stringTag] = cloneableTags[symbolTag] =
320 cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =
321 cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;
322 cloneableTags[errorTag] = cloneableTags[funcTag] =
323 cloneableTags[weakMapTag] = false;
325 /** Used to map Latin Unicode letters to basic Latin letters. */
326 var deburredLetters = {
327 // Latin-1 Supplement block.
328 '\xc0': 'A', '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A',
329 '\xe0': 'a', '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a',
330 '\xc7': 'C', '\xe7': 'c',
331 '\xd0': 'D', '\xf0': 'd',
332 '\xc8': 'E', '\xc9': 'E', '\xca': 'E', '\xcb': 'E',
333 '\xe8': 'e', '\xe9': 'e', '\xea': 'e', '\xeb': 'e',
334 '\xcc': 'I', '\xcd': 'I', '\xce': 'I', '\xcf': 'I',
335 '\xec': 'i', '\xed': 'i', '\xee': 'i', '\xef': 'i',
336 '\xd1': 'N', '\xf1': 'n',
337 '\xd2': 'O', '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O',
338 '\xf2': 'o', '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o',
339 '\xd9': 'U', '\xda': 'U', '\xdb': 'U', '\xdc': 'U',
340 '\xf9': 'u', '\xfa': 'u', '\xfb': 'u', '\xfc': 'u',
341 '\xdd': 'Y', '\xfd': 'y', '\xff': 'y',
342 '\xc6': 'Ae', '\xe6': 'ae',
343 '\xde': 'Th', '\xfe': 'th',
345 // Latin Extended-A block.
346 '\u0100': 'A', '\u0102': 'A', '\u0104': 'A',
347 '\u0101': 'a', '\u0103': 'a', '\u0105': 'a',
348 '\u0106': 'C', '\u0108': 'C', '\u010a': 'C', '\u010c': 'C',
349 '\u0107': 'c', '\u0109': 'c', '\u010b': 'c', '\u010d': 'c',
350 '\u010e': 'D', '\u0110': 'D', '\u010f': 'd', '\u0111': 'd',
351 '\u0112': 'E', '\u0114': 'E', '\u0116': 'E', '\u0118': 'E', '\u011a': 'E',
352 '\u0113': 'e', '\u0115': 'e', '\u0117': 'e', '\u0119': 'e', '\u011b': 'e',
353 '\u011c': 'G', '\u011e': 'G', '\u0120': 'G', '\u0122': 'G',
354 '\u011d': 'g', '\u011f': 'g', '\u0121': 'g', '\u0123': 'g',
355 '\u0124': 'H', '\u0126': 'H', '\u0125': 'h', '\u0127': 'h',
356 '\u0128': 'I', '\u012a': 'I', '\u012c': 'I', '\u012e': 'I', '\u0130': 'I',
357 '\u0129': 'i', '\u012b': 'i', '\u012d': 'i', '\u012f': 'i', '\u0131': 'i',
358 '\u0134': 'J', '\u0135': 'j',
359 '\u0136': 'K', '\u0137': 'k', '\u0138': 'k',
360 '\u0139': 'L', '\u013b': 'L', '\u013d': 'L', '\u013f': 'L', '\u0141': 'L',
361 '\u013a': 'l', '\u013c': 'l', '\u013e': 'l', '\u0140': 'l', '\u0142': 'l',
362 '\u0143': 'N', '\u0145': 'N', '\u0147': 'N', '\u014a': 'N',
363 '\u0144': 'n', '\u0146': 'n', '\u0148': 'n', '\u014b': 'n',
364 '\u014c': 'O', '\u014e': 'O', '\u0150': 'O',
365 '\u014d': 'o', '\u014f': 'o', '\u0151': 'o',
366 '\u0154': 'R', '\u0156': 'R', '\u0158': 'R',
367 '\u0155': 'r', '\u0157': 'r', '\u0159': 'r',
368 '\u015a': 'S', '\u015c': 'S', '\u015e': 'S', '\u0160': 'S',
369 '\u015b': 's', '\u015d': 's', '\u015f': 's', '\u0161': 's',
370 '\u0162': 'T', '\u0164': 'T', '\u0166': 'T',
371 '\u0163': 't', '\u0165': 't', '\u0167': 't',
372 '\u0168': 'U', '\u016a': 'U', '\u016c': 'U', '\u016e': 'U', '\u0170': 'U', '\u0172': 'U',
373 '\u0169': 'u', '\u016b': 'u', '\u016d': 'u', '\u016f': 'u', '\u0171': 'u', '\u0173': 'u',
374 '\u0174': 'W', '\u0175': 'w',
375 '\u0176': 'Y', '\u0177': 'y', '\u0178': 'Y',
376 '\u0179': 'Z', '\u017b': 'Z', '\u017d': 'Z',
377 '\u017a': 'z', '\u017c': 'z', '\u017e': 'z',
378 '\u0132': 'IJ', '\u0133': 'ij',
379 '\u0152': 'Oe', '\u0153': 'oe',
380 '\u0149': "'n", '\u017f': 's'
383 /** Used to map characters to HTML entities. */
392 /** Used to map HTML entities to characters. */
393 var htmlUnescapes = {
401 /** Used to escape characters for inclusion in compiled string literals. */
402 var stringEscapes = {
411 /** Built-in method references without a dependency on `root`. */
412 var freeParseFloat = parseFloat,
413 freeParseInt = parseInt;
415 /** Detect free variable `global` from Node.js. */
416 var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
418 /** Detect free variable `self`. */
419 var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
421 /** Used as a reference to the global object. */
422 var root = freeGlobal || freeSelf || Function('return this')();
424 /** Detect free variable `exports`. */
425 var freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;
427 /** Detect free variable `module`. */
428 var freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;
430 /** Detect the popular CommonJS extension `module.exports`. */
431 var moduleExports = freeModule && freeModule.exports === freeExports;
433 /** Detect free variable `process` from Node.js. */
434 var freeProcess = moduleExports && freeGlobal.process;
436 /** Used to access faster Node.js helpers. */
437 var nodeUtil = (function() {
439 // Use `util.types` for Node.js 10+.
440 var types = freeModule && freeModule.require && freeModule.require('util').types;
446 // Legacy `process.binding('util')` for Node.js < 10.
447 return freeProcess && freeProcess.binding && freeProcess.binding('util');
451 /* Node.js helper references. */
452 var nodeIsArrayBuffer = nodeUtil && nodeUtil.isArrayBuffer,
453 nodeIsDate = nodeUtil && nodeUtil.isDate,
454 nodeIsMap = nodeUtil && nodeUtil.isMap,
455 nodeIsRegExp = nodeUtil && nodeUtil.isRegExp,
456 nodeIsSet = nodeUtil && nodeUtil.isSet,
457 nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;
459 /*--------------------------------------------------------------------------*/
462 * A faster alternative to `Function#apply`, this function invokes `func`
463 * with the `this` binding of `thisArg` and the arguments of `args`.
466 * @param {Function} func The function to invoke.
467 * @param {*} thisArg The `this` binding of `func`.
468 * @param {Array} args The arguments to invoke `func` with.
469 * @returns {*} Returns the result of `func`.
471 function apply(func, thisArg, args) {
472 switch (args.length) {
473 case 0: return func.call(thisArg);
474 case 1: return func.call(thisArg, args[0]);
475 case 2: return func.call(thisArg, args[0], args[1]);
476 case 3: return func.call(thisArg, args[0], args[1], args[2]);
478 return func.apply(thisArg, args);
482 * A specialized version of `baseAggregator` for arrays.
485 * @param {Array} [array] The array to iterate over.
486 * @param {Function} setter The function to set `accumulator` values.
487 * @param {Function} iteratee The iteratee to transform keys.
488 * @param {Object} accumulator The initial aggregated object.
489 * @returns {Function} Returns `accumulator`.
491 function arrayAggregator(array, setter, iteratee, accumulator) {
493 length = array == null ? 0 : array.length;
495 while (++index < length) {
496 var value = array[index];
497 setter(accumulator, value, iteratee(value), array);
503 * A specialized version of `_.forEach` for arrays without support for
504 * iteratee shorthands.
507 * @param {Array} [array] The array to iterate over.
508 * @param {Function} iteratee The function invoked per iteration.
509 * @returns {Array} Returns `array`.
511 function arrayEach(array, iteratee) {
513 length = array == null ? 0 : array.length;
515 while (++index < length) {
516 if (iteratee(array[index], index, array) === false) {
524 * A specialized version of `_.forEachRight` for arrays without support for
525 * iteratee shorthands.
528 * @param {Array} [array] The array to iterate over.
529 * @param {Function} iteratee The function invoked per iteration.
530 * @returns {Array} Returns `array`.
532 function arrayEachRight(array, iteratee) {
533 var length = array == null ? 0 : array.length;
536 if (iteratee(array[length], length, array) === false) {
544 * A specialized version of `_.every` for arrays without support for
545 * iteratee shorthands.
548 * @param {Array} [array] The array to iterate over.
549 * @param {Function} predicate The function invoked per iteration.
550 * @returns {boolean} Returns `true` if all elements pass the predicate check,
553 function arrayEvery(array, predicate) {
555 length = array == null ? 0 : array.length;
557 while (++index < length) {
558 if (!predicate(array[index], index, array)) {
566 * A specialized version of `_.filter` for arrays without support for
567 * iteratee shorthands.
570 * @param {Array} [array] The array to iterate over.
571 * @param {Function} predicate The function invoked per iteration.
572 * @returns {Array} Returns the new filtered array.
574 function arrayFilter(array, predicate) {
576 length = array == null ? 0 : array.length,
580 while (++index < length) {
581 var value = array[index];
582 if (predicate(value, index, array)) {
583 result[resIndex++] = value;
590 * A specialized version of `_.includes` for arrays without support for
591 * specifying an index to search from.
594 * @param {Array} [array] The array to inspect.
595 * @param {*} target The value to search for.
596 * @returns {boolean} Returns `true` if `target` is found, else `false`.
598 function arrayIncludes(array, value) {
599 var length = array == null ? 0 : array.length;
600 return !!length && baseIndexOf(array, value, 0) > -1;
604 * This function is like `arrayIncludes` except that it accepts a comparator.
607 * @param {Array} [array] The array to inspect.
608 * @param {*} target The value to search for.
609 * @param {Function} comparator The comparator invoked per element.
610 * @returns {boolean} Returns `true` if `target` is found, else `false`.
612 function arrayIncludesWith(array, value, comparator) {
614 length = array == null ? 0 : array.length;
616 while (++index < length) {
617 if (comparator(value, array[index])) {
625 * A specialized version of `_.map` for arrays without support for iteratee
629 * @param {Array} [array] The array to iterate over.
630 * @param {Function} iteratee The function invoked per iteration.
631 * @returns {Array} Returns the new mapped array.
633 function arrayMap(array, iteratee) {
635 length = array == null ? 0 : array.length,
636 result = Array(length);
638 while (++index < length) {
639 result[index] = iteratee(array[index], index, array);
645 * Appends the elements of `values` to `array`.
648 * @param {Array} array The array to modify.
649 * @param {Array} values The values to append.
650 * @returns {Array} Returns `array`.
652 function arrayPush(array, values) {
654 length = values.length,
655 offset = array.length;
657 while (++index < length) {
658 array[offset + index] = values[index];
664 * A specialized version of `_.reduce` for arrays without support for
665 * iteratee shorthands.
668 * @param {Array} [array] The array to iterate over.
669 * @param {Function} iteratee The function invoked per iteration.
670 * @param {*} [accumulator] The initial value.
671 * @param {boolean} [initAccum] Specify using the first element of `array` as
673 * @returns {*} Returns the accumulated value.
675 function arrayReduce(array, iteratee, accumulator, initAccum) {
677 length = array == null ? 0 : array.length;
679 if (initAccum && length) {
680 accumulator = array[++index];
682 while (++index < length) {
683 accumulator = iteratee(accumulator, array[index], index, array);
689 * A specialized version of `_.reduceRight` for arrays without support for
690 * iteratee shorthands.
693 * @param {Array} [array] The array to iterate over.
694 * @param {Function} iteratee The function invoked per iteration.
695 * @param {*} [accumulator] The initial value.
696 * @param {boolean} [initAccum] Specify using the last element of `array` as
698 * @returns {*} Returns the accumulated value.
700 function arrayReduceRight(array, iteratee, accumulator, initAccum) {
701 var length = array == null ? 0 : array.length;
702 if (initAccum && length) {
703 accumulator = array[--length];
706 accumulator = iteratee(accumulator, array[length], length, array);
712 * A specialized version of `_.some` for arrays without support for iteratee
716 * @param {Array} [array] The array to iterate over.
717 * @param {Function} predicate The function invoked per iteration.
718 * @returns {boolean} Returns `true` if any element passes the predicate check,
721 function arraySome(array, predicate) {
723 length = array == null ? 0 : array.length;
725 while (++index < length) {
726 if (predicate(array[index], index, array)) {
734 * Gets the size of an ASCII `string`.
737 * @param {string} string The string inspect.
738 * @returns {number} Returns the string size.
740 var asciiSize = baseProperty('length');
743 * Converts an ASCII `string` to an array.
746 * @param {string} string The string to convert.
747 * @returns {Array} Returns the converted array.
749 function asciiToArray(string) {
750 return string.split('');
754 * Splits an ASCII `string` into an array of its words.
757 * @param {string} The string to inspect.
758 * @returns {Array} Returns the words of `string`.
760 function asciiWords(string) {
761 return string.match(reAsciiWord) || [];
765 * The base implementation of methods like `_.findKey` and `_.findLastKey`,
766 * without support for iteratee shorthands, which iterates over `collection`
770 * @param {Array|Object} collection The collection to inspect.
771 * @param {Function} predicate The function invoked per iteration.
772 * @param {Function} eachFunc The function to iterate over `collection`.
773 * @returns {*} Returns the found element or its key, else `undefined`.
775 function baseFindKey(collection, predicate, eachFunc) {
777 eachFunc(collection, function(value, key, collection) {
778 if (predicate(value, key, collection)) {
787 * The base implementation of `_.findIndex` and `_.findLastIndex` without
788 * support for iteratee shorthands.
791 * @param {Array} array The array to inspect.
792 * @param {Function} predicate The function invoked per iteration.
793 * @param {number} fromIndex The index to search from.
794 * @param {boolean} [fromRight] Specify iterating from right to left.
795 * @returns {number} Returns the index of the matched value, else `-1`.
797 function baseFindIndex(array, predicate, fromIndex, fromRight) {
798 var length = array.length,
799 index = fromIndex + (fromRight ? 1 : -1);
801 while ((fromRight ? index-- : ++index < length)) {
802 if (predicate(array[index], index, array)) {
810 * The base implementation of `_.indexOf` without `fromIndex` bounds checks.
813 * @param {Array} array The array to inspect.
814 * @param {*} value The value to search for.
815 * @param {number} fromIndex The index to search from.
816 * @returns {number} Returns the index of the matched value, else `-1`.
818 function baseIndexOf(array, value, fromIndex) {
819 return value === value
820 ? strictIndexOf(array, value, fromIndex)
821 : baseFindIndex(array, baseIsNaN, fromIndex);
825 * This function is like `baseIndexOf` except that it accepts a comparator.
828 * @param {Array} array The array to inspect.
829 * @param {*} value The value to search for.
830 * @param {number} fromIndex The index to search from.
831 * @param {Function} comparator The comparator invoked per element.
832 * @returns {number} Returns the index of the matched value, else `-1`.
834 function baseIndexOfWith(array, value, fromIndex, comparator) {
835 var index = fromIndex - 1,
836 length = array.length;
838 while (++index < length) {
839 if (comparator(array[index], value)) {
847 * The base implementation of `_.isNaN` without support for number objects.
850 * @param {*} value The value to check.
851 * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
853 function baseIsNaN(value) {
854 return value !== value;
858 * The base implementation of `_.mean` and `_.meanBy` without support for
859 * iteratee shorthands.
862 * @param {Array} array The array to iterate over.
863 * @param {Function} iteratee The function invoked per iteration.
864 * @returns {number} Returns the mean.
866 function baseMean(array, iteratee) {
867 var length = array == null ? 0 : array.length;
868 return length ? (baseSum(array, iteratee) / length) : NAN;
872 * The base implementation of `_.property` without support for deep paths.
875 * @param {string} key The key of the property to get.
876 * @returns {Function} Returns the new accessor function.
878 function baseProperty(key) {
879 return function(object) {
880 return object == null ? undefined : object[key];
885 * The base implementation of `_.propertyOf` without support for deep paths.
888 * @param {Object} object The object to query.
889 * @returns {Function} Returns the new accessor function.
891 function basePropertyOf(object) {
892 return function(key) {
893 return object == null ? undefined : object[key];
898 * The base implementation of `_.reduce` and `_.reduceRight`, without support
899 * for iteratee shorthands, which iterates over `collection` using `eachFunc`.
902 * @param {Array|Object} collection The collection to iterate over.
903 * @param {Function} iteratee The function invoked per iteration.
904 * @param {*} accumulator The initial value.
905 * @param {boolean} initAccum Specify using the first or last element of
906 * `collection` as the initial value.
907 * @param {Function} eachFunc The function to iterate over `collection`.
908 * @returns {*} Returns the accumulated value.
910 function baseReduce(collection, iteratee, accumulator, initAccum, eachFunc) {
911 eachFunc(collection, function(value, index, collection) {
912 accumulator = initAccum
913 ? (initAccum = false, value)
914 : iteratee(accumulator, value, index, collection);
920 * The base implementation of `_.sortBy` which uses `comparer` to define the
921 * sort order of `array` and replaces criteria objects with their corresponding
925 * @param {Array} array The array to sort.
926 * @param {Function} comparer The function to define sort order.
927 * @returns {Array} Returns `array`.
929 function baseSortBy(array, comparer) {
930 var length = array.length;
932 array.sort(comparer);
934 array[length] = array[length].value;
940 * The base implementation of `_.sum` and `_.sumBy` without support for
941 * iteratee shorthands.
944 * @param {Array} array The array to iterate over.
945 * @param {Function} iteratee The function invoked per iteration.
946 * @returns {number} Returns the sum.
948 function baseSum(array, iteratee) {
951 length = array.length;
953 while (++index < length) {
954 var current = iteratee(array[index]);
955 if (current !== undefined) {
956 result = result === undefined ? current : (result + current);
963 * The base implementation of `_.times` without support for iteratee shorthands
964 * or max array length checks.
967 * @param {number} n The number of times to invoke `iteratee`.
968 * @param {Function} iteratee The function invoked per iteration.
969 * @returns {Array} Returns the array of results.
971 function baseTimes(n, iteratee) {
975 while (++index < n) {
976 result[index] = iteratee(index);
982 * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array
983 * of key-value pairs for `object` corresponding to the property names of `props`.
986 * @param {Object} object The object to query.
987 * @param {Array} props The property names to get values for.
988 * @returns {Object} Returns the key-value pairs.
990 function baseToPairs(object, props) {
991 return arrayMap(props, function(key) {
992 return [key, object[key]];
997 * The base implementation of `_.unary` without support for storing metadata.
1000 * @param {Function} func The function to cap arguments for.
1001 * @returns {Function} Returns the new capped function.
1003 function baseUnary(func) {
1004 return function(value) {
1010 * The base implementation of `_.values` and `_.valuesIn` which creates an
1011 * array of `object` property values corresponding to the property names
1015 * @param {Object} object The object to query.
1016 * @param {Array} props The property names to get values for.
1017 * @returns {Object} Returns the array of property values.
1019 function baseValues(object, props) {
1020 return arrayMap(props, function(key) {
1026 * Checks if a `cache` value for `key` exists.
1029 * @param {Object} cache The cache to query.
1030 * @param {string} key The key of the entry to check.
1031 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
1033 function cacheHas(cache, key) {
1034 return cache.has(key);
1038 * Used by `_.trim` and `_.trimStart` to get the index of the first string symbol
1039 * that is not found in the character symbols.
1042 * @param {Array} strSymbols The string symbols to inspect.
1043 * @param {Array} chrSymbols The character symbols to find.
1044 * @returns {number} Returns the index of the first unmatched string symbol.
1046 function charsStartIndex(strSymbols, chrSymbols) {
1048 length = strSymbols.length;
1050 while (++index < length && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
1055 * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
1056 * that is not found in the character symbols.
1059 * @param {Array} strSymbols The string symbols to inspect.
1060 * @param {Array} chrSymbols The character symbols to find.
1061 * @returns {number} Returns the index of the last unmatched string symbol.
1063 function charsEndIndex(strSymbols, chrSymbols) {
1064 var index = strSymbols.length;
1066 while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
1071 * Gets the number of `placeholder` occurrences in `array`.
1074 * @param {Array} array The array to inspect.
1075 * @param {*} placeholder The placeholder to search for.
1076 * @returns {number} Returns the placeholder count.
1078 function countHolders(array, placeholder) {
1079 var length = array.length,
1083 if (array[length] === placeholder) {
1091 * Used by `_.deburr` to convert Latin-1 Supplement and Latin Extended-A
1092 * letters to basic Latin letters.
1095 * @param {string} letter The matched letter to deburr.
1096 * @returns {string} Returns the deburred letter.
1098 var deburrLetter = basePropertyOf(deburredLetters);
1101 * Used by `_.escape` to convert characters to HTML entities.
1104 * @param {string} chr The matched character to escape.
1105 * @returns {string} Returns the escaped character.
1107 var escapeHtmlChar = basePropertyOf(htmlEscapes);
1110 * Used by `_.template` to escape characters for inclusion in compiled string literals.
1113 * @param {string} chr The matched character to escape.
1114 * @returns {string} Returns the escaped character.
1116 function escapeStringChar(chr) {
1117 return '\\' + stringEscapes[chr];
1121 * Gets the value at `key` of `object`.
1124 * @param {Object} [object] The object to query.
1125 * @param {string} key The key of the property to get.
1126 * @returns {*} Returns the property value.
1128 function getValue(object, key) {
1129 return object == null ? undefined : object[key];
1133 * Checks if `string` contains Unicode symbols.
1136 * @param {string} string The string to inspect.
1137 * @returns {boolean} Returns `true` if a symbol is found, else `false`.
1139 function hasUnicode(string) {
1140 return reHasUnicode.test(string);
1144 * Checks if `string` contains a word composed of Unicode symbols.
1147 * @param {string} string The string to inspect.
1148 * @returns {boolean} Returns `true` if a word is found, else `false`.
1150 function hasUnicodeWord(string) {
1151 return reHasUnicodeWord.test(string);
1155 * Converts `iterator` to an array.
1158 * @param {Object} iterator The iterator to convert.
1159 * @returns {Array} Returns the converted array.
1161 function iteratorToArray(iterator) {
1165 while (!(data = iterator.next()).done) {
1166 result.push(data.value);
1172 * Converts `map` to its key-value pairs.
1175 * @param {Object} map The map to convert.
1176 * @returns {Array} Returns the key-value pairs.
1178 function mapToArray(map) {
1180 result = Array(map.size);
1182 map.forEach(function(value, key) {
1183 result[++index] = [key, value];
1189 * Creates a unary function that invokes `func` with its argument transformed.
1192 * @param {Function} func The function to wrap.
1193 * @param {Function} transform The argument transform.
1194 * @returns {Function} Returns the new function.
1196 function overArg(func, transform) {
1197 return function(arg) {
1198 return func(transform(arg));
1203 * Replaces all `placeholder` elements in `array` with an internal placeholder
1204 * and returns an array of their indexes.
1207 * @param {Array} array The array to modify.
1208 * @param {*} placeholder The placeholder to replace.
1209 * @returns {Array} Returns the new array of placeholder indexes.
1211 function replaceHolders(array, placeholder) {
1213 length = array.length,
1217 while (++index < length) {
1218 var value = array[index];
1219 if (value === placeholder || value === PLACEHOLDER) {
1220 array[index] = PLACEHOLDER;
1221 result[resIndex++] = index;
1228 * Converts `set` to an array of its values.
1231 * @param {Object} set The set to convert.
1232 * @returns {Array} Returns the values.
1234 function setToArray(set) {
1236 result = Array(set.size);
1238 set.forEach(function(value) {
1239 result[++index] = value;
1245 * Converts `set` to its value-value pairs.
1248 * @param {Object} set The set to convert.
1249 * @returns {Array} Returns the value-value pairs.
1251 function setToPairs(set) {
1253 result = Array(set.size);
1255 set.forEach(function(value) {
1256 result[++index] = [value, value];
1262 * A specialized version of `_.indexOf` which performs strict equality
1263 * comparisons of values, i.e. `===`.
1266 * @param {Array} array The array to inspect.
1267 * @param {*} value The value to search for.
1268 * @param {number} fromIndex The index to search from.
1269 * @returns {number} Returns the index of the matched value, else `-1`.
1271 function strictIndexOf(array, value, fromIndex) {
1272 var index = fromIndex - 1,
1273 length = array.length;
1275 while (++index < length) {
1276 if (array[index] === value) {
1284 * A specialized version of `_.lastIndexOf` which performs strict equality
1285 * comparisons of values, i.e. `===`.
1288 * @param {Array} array The array to inspect.
1289 * @param {*} value The value to search for.
1290 * @param {number} fromIndex The index to search from.
1291 * @returns {number} Returns the index of the matched value, else `-1`.
1293 function strictLastIndexOf(array, value, fromIndex) {
1294 var index = fromIndex + 1;
1296 if (array[index] === value) {
1304 * Gets the number of symbols in `string`.
1307 * @param {string} string The string to inspect.
1308 * @returns {number} Returns the string size.
1310 function stringSize(string) {
1311 return hasUnicode(string)
1312 ? unicodeSize(string)
1313 : asciiSize(string);
1317 * Converts `string` to an array.
1320 * @param {string} string The string to convert.
1321 * @returns {Array} Returns the converted array.
1323 function stringToArray(string) {
1324 return hasUnicode(string)
1325 ? unicodeToArray(string)
1326 : asciiToArray(string);
1330 * Used by `_.unescape` to convert HTML entities to characters.
1333 * @param {string} chr The matched character to unescape.
1334 * @returns {string} Returns the unescaped character.
1336 var unescapeHtmlChar = basePropertyOf(htmlUnescapes);
1339 * Gets the size of a Unicode `string`.
1342 * @param {string} string The string inspect.
1343 * @returns {number} Returns the string size.
1345 function unicodeSize(string) {
1346 var result = reUnicode.lastIndex = 0;
1347 while (reUnicode.test(string)) {
1354 * Converts a Unicode `string` to an array.
1357 * @param {string} string The string to convert.
1358 * @returns {Array} Returns the converted array.
1360 function unicodeToArray(string) {
1361 return string.match(reUnicode) || [];
1365 * Splits a Unicode `string` into an array of its words.
1368 * @param {string} The string to inspect.
1369 * @returns {Array} Returns the words of `string`.
1371 function unicodeWords(string) {
1372 return string.match(reUnicodeWord) || [];
1375 /*--------------------------------------------------------------------------*/
1378 * Create a new pristine `lodash` function using the `context` object.
1384 * @param {Object} [context=root] The context object.
1385 * @returns {Function} Returns a new `lodash` function.
1388 * _.mixin({ 'foo': _.constant('foo') });
1390 * var lodash = _.runInContext();
1391 * lodash.mixin({ 'bar': lodash.constant('bar') });
1393 * _.isFunction(_.foo);
1395 * _.isFunction(_.bar);
1398 * lodash.isFunction(lodash.foo);
1400 * lodash.isFunction(lodash.bar);
1403 * // Create a suped-up `defer` in Node.js.
1404 * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer;
1406 var runInContext = (function runInContext(context) {
1407 context = context == null ? root : _.defaults(root.Object(), context, _.pick(root, contextProps));
1409 /** Built-in constructor references. */
1410 var Array = context.Array,
1411 Date = context.Date,
1412 Error = context.Error,
1413 Function = context.Function,
1414 Math = context.Math,
1415 Object = context.Object,
1416 RegExp = context.RegExp,
1417 String = context.String,
1418 TypeError = context.TypeError;
1420 /** Used for built-in method references. */
1421 var arrayProto = Array.prototype,
1422 funcProto = Function.prototype,
1423 objectProto = Object.prototype;
1425 /** Used to detect overreaching core-js shims. */
1426 var coreJsData = context['__core-js_shared__'];
1428 /** Used to resolve the decompiled source of functions. */
1429 var funcToString = funcProto.toString;
1431 /** Used to check objects for own properties. */
1432 var hasOwnProperty = objectProto.hasOwnProperty;
1434 /** Used to generate unique IDs. */
1437 /** Used to detect methods masquerading as native. */
1438 var maskSrcKey = (function() {
1439 var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');
1440 return uid ? ('Symbol(src)_1.' + uid) : '';
1444 * Used to resolve the
1445 * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
1448 var nativeObjectToString = objectProto.toString;
1450 /** Used to infer the `Object` constructor. */
1451 var objectCtorString = funcToString.call(Object);
1453 /** Used to restore the original `_` reference in `_.noConflict`. */
1454 var oldDash = root._;
1456 /** Used to detect if a method is native. */
1457 var reIsNative = RegExp('^' +
1458 funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\$&')
1459 .replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
1462 /** Built-in value references. */
1463 var Buffer = moduleExports ? context.Buffer : undefined,
1464 Symbol = context.Symbol,
1465 Uint8Array = context.Uint8Array,
1466 allocUnsafe = Buffer ? Buffer.allocUnsafe : undefined,
1467 getPrototype = overArg(Object.getPrototypeOf, Object),
1468 objectCreate = Object.create,
1469 propertyIsEnumerable = objectProto.propertyIsEnumerable,
1470 splice = arrayProto.splice,
1471 spreadableSymbol = Symbol ? Symbol.isConcatSpreadable : undefined,
1472 symIterator = Symbol ? Symbol.iterator : undefined,
1473 symToStringTag = Symbol ? Symbol.toStringTag : undefined;
1475 var defineProperty = (function() {
1477 var func = getNative(Object, 'defineProperty');
1483 /** Mocked built-ins. */
1484 var ctxClearTimeout = context.clearTimeout !== root.clearTimeout && context.clearTimeout,
1485 ctxNow = Date && Date.now !== root.Date.now && Date.now,
1486 ctxSetTimeout = context.setTimeout !== root.setTimeout && context.setTimeout;
1488 /* Built-in method references for those with the same name as other `lodash` methods. */
1489 var nativeCeil = Math.ceil,
1490 nativeFloor = Math.floor,
1491 nativeGetSymbols = Object.getOwnPropertySymbols,
1492 nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined,
1493 nativeIsFinite = context.isFinite,
1494 nativeJoin = arrayProto.join,
1495 nativeKeys = overArg(Object.keys, Object),
1496 nativeMax = Math.max,
1497 nativeMin = Math.min,
1498 nativeNow = Date.now,
1499 nativeParseInt = context.parseInt,
1500 nativeRandom = Math.random,
1501 nativeReverse = arrayProto.reverse;
1503 /* Built-in method references that are verified to be native. */
1504 var DataView = getNative(context, 'DataView'),
1505 Map = getNative(context, 'Map'),
1506 Promise = getNative(context, 'Promise'),
1507 Set = getNative(context, 'Set'),
1508 WeakMap = getNative(context, 'WeakMap'),
1509 nativeCreate = getNative(Object, 'create');
1511 /** Used to store function metadata. */
1512 var metaMap = WeakMap && new WeakMap;
1514 /** Used to lookup unminified function names. */
1517 /** Used to detect maps, sets, and weakmaps. */
1518 var dataViewCtorString = toSource(DataView),
1519 mapCtorString = toSource(Map),
1520 promiseCtorString = toSource(Promise),
1521 setCtorString = toSource(Set),
1522 weakMapCtorString = toSource(WeakMap);
1524 /** Used to convert symbols to primitives and strings. */
1525 var symbolProto = Symbol ? Symbol.prototype : undefined,
1526 symbolValueOf = symbolProto ? symbolProto.valueOf : undefined,
1527 symbolToString = symbolProto ? symbolProto.toString : undefined;
1529 /*------------------------------------------------------------------------*/
1532 * Creates a `lodash` object which wraps `value` to enable implicit method
1533 * chain sequences. Methods that operate on and return arrays, collections,
1534 * and functions can be chained together. Methods that retrieve a single value
1535 * or may return a primitive value will automatically end the chain sequence
1536 * and return the unwrapped value. Otherwise, the value must be unwrapped
1539 * Explicit chain sequences, which must be unwrapped with `_#value`, may be
1540 * enabled using `_.chain`.
1542 * The execution of chained methods is lazy, that is, it's deferred until
1543 * `_#value` is implicitly or explicitly called.
1545 * Lazy evaluation allows several methods to support shortcut fusion.
1546 * Shortcut fusion is an optimization to merge iteratee calls; this avoids
1547 * the creation of intermediate arrays and can greatly reduce the number of
1548 * iteratee executions. Sections of a chain sequence qualify for shortcut
1549 * fusion if the section is applied to an array and iteratees accept only
1550 * one argument. The heuristic for whether a section qualifies for shortcut
1551 * fusion is subject to change.
1553 * Chaining is supported in custom builds as long as the `_#value` method is
1554 * directly or indirectly included in the build.
1556 * In addition to lodash methods, wrappers have `Array` and `String` methods.
1558 * The wrapper `Array` methods are:
1559 * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`
1561 * The wrapper `String` methods are:
1562 * `replace` and `split`
1564 * The wrapper methods that support shortcut fusion are:
1565 * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,
1566 * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,
1567 * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`
1569 * The chainable wrapper methods are:
1570 * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,
1571 * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,
1572 * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,
1573 * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,
1574 * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,
1575 * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,
1576 * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,
1577 * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,
1578 * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,
1579 * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,
1580 * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,
1581 * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,
1582 * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,
1583 * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,
1584 * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,
1585 * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,
1586 * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,
1587 * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,
1588 * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,
1589 * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,
1590 * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,
1591 * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,
1592 * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,
1593 * `zipObject`, `zipObjectDeep`, and `zipWith`
1595 * The wrapper methods that are **not** chainable by default are:
1596 * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,
1597 * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,
1598 * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,
1599 * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,
1600 * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,
1601 * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,
1602 * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,
1603 * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,
1604 * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,
1605 * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,
1606 * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,
1607 * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,
1608 * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,
1609 * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,
1610 * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,
1611 * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,
1612 * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,
1613 * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,
1614 * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,
1615 * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,
1616 * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,
1617 * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,
1618 * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,
1619 * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,
1620 * `upperFirst`, `value`, and `words`
1625 * @param {*} value The value to wrap in a `lodash` instance.
1626 * @returns {Object} Returns the new `lodash` wrapper instance.
1629 * function square(n) {
1633 * var wrapped = _([1, 2, 3]);
1635 * // Returns an unwrapped value.
1636 * wrapped.reduce(_.add);
1639 * // Returns a wrapped value.
1640 * var squares = wrapped.map(square);
1642 * _.isArray(squares);
1645 * _.isArray(squares.value());
1648 function lodash(value) {
1649 if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {
1650 if (value instanceof LodashWrapper) {
1653 if (hasOwnProperty.call(value, '__wrapped__')) {
1654 return wrapperClone(value);
1657 return new LodashWrapper(value);
1661 * The base implementation of `_.create` without support for assigning
1662 * properties to the created object.
1665 * @param {Object} proto The object to inherit from.
1666 * @returns {Object} Returns the new object.
1668 var baseCreate = (function() {
1669 function object() {}
1670 return function(proto) {
1671 if (!isObject(proto)) {
1675 return objectCreate(proto);
1677 object.prototype = proto;
1678 var result = new object;
1679 object.prototype = undefined;
1685 * The function whose prototype chain sequence wrappers inherit from.
1689 function baseLodash() {
1690 // No operation performed.
1694 * The base constructor for creating `lodash` wrapper objects.
1697 * @param {*} value The value to wrap.
1698 * @param {boolean} [chainAll] Enable explicit method chain sequences.
1700 function LodashWrapper(value, chainAll) {
1701 this.__wrapped__ = value;
1702 this.__actions__ = [];
1703 this.__chain__ = !!chainAll;
1705 this.__values__ = undefined;
1709 * By default, the template delimiters used by lodash are like those in
1710 * embedded Ruby (ERB) as well as ES2015 template strings. Change the
1711 * following template settings to use alternative delimiters.
1717 lodash.templateSettings = {
1720 * Used to detect `data` property values to be HTML-escaped.
1722 * @memberOf _.templateSettings
1728 * Used to detect code to be evaluated.
1730 * @memberOf _.templateSettings
1733 'evaluate': reEvaluate,
1736 * Used to detect `data` property values to inject.
1738 * @memberOf _.templateSettings
1741 'interpolate': reInterpolate,
1744 * Used to reference the data object in the template text.
1746 * @memberOf _.templateSettings
1752 * Used to import variables into the compiled template.
1754 * @memberOf _.templateSettings
1760 * A reference to the `lodash` function.
1762 * @memberOf _.templateSettings.imports
1769 // Ensure wrappers are instances of `baseLodash`.
1770 lodash.prototype = baseLodash.prototype;
1771 lodash.prototype.constructor = lodash;
1773 LodashWrapper.prototype = baseCreate(baseLodash.prototype);
1774 LodashWrapper.prototype.constructor = LodashWrapper;
1776 /*------------------------------------------------------------------------*/
1779 * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation.
1783 * @param {*} value The value to wrap.
1785 function LazyWrapper(value) {
1786 this.__wrapped__ = value;
1787 this.__actions__ = [];
1789 this.__filtered__ = false;
1790 this.__iteratees__ = [];
1791 this.__takeCount__ = MAX_ARRAY_LENGTH;
1792 this.__views__ = [];
1796 * Creates a clone of the lazy wrapper object.
1800 * @memberOf LazyWrapper
1801 * @returns {Object} Returns the cloned `LazyWrapper` object.
1803 function lazyClone() {
1804 var result = new LazyWrapper(this.__wrapped__);
1805 result.__actions__ = copyArray(this.__actions__);
1806 result.__dir__ = this.__dir__;
1807 result.__filtered__ = this.__filtered__;
1808 result.__iteratees__ = copyArray(this.__iteratees__);
1809 result.__takeCount__ = this.__takeCount__;
1810 result.__views__ = copyArray(this.__views__);
1815 * Reverses the direction of lazy iteration.
1819 * @memberOf LazyWrapper
1820 * @returns {Object} Returns the new reversed `LazyWrapper` object.
1822 function lazyReverse() {
1823 if (this.__filtered__) {
1824 var result = new LazyWrapper(this);
1825 result.__dir__ = -1;
1826 result.__filtered__ = true;
1828 result = this.clone();
1829 result.__dir__ *= -1;
1835 * Extracts the unwrapped value from its lazy wrapper.
1839 * @memberOf LazyWrapper
1840 * @returns {*} Returns the unwrapped value.
1842 function lazyValue() {
1843 var array = this.__wrapped__.value(),
1845 isArr = isArray(array),
1847 arrLength = isArr ? array.length : 0,
1848 view = getView(0, arrLength, this.__views__),
1851 length = end - start,
1852 index = isRight ? end : (start - 1),
1853 iteratees = this.__iteratees__,
1854 iterLength = iteratees.length,
1856 takeCount = nativeMin(length, this.__takeCount__);
1858 if (!isArr || (!isRight && arrLength == length && takeCount == length)) {
1859 return baseWrapperValue(array, this.__actions__);
1864 while (length-- && resIndex < takeCount) {
1868 value = array[index];
1870 while (++iterIndex < iterLength) {
1871 var data = iteratees[iterIndex],
1872 iteratee = data.iteratee,
1874 computed = iteratee(value);
1876 if (type == LAZY_MAP_FLAG) {
1878 } else if (!computed) {
1879 if (type == LAZY_FILTER_FLAG) {
1886 result[resIndex++] = value;
1891 // Ensure `LazyWrapper` is an instance of `baseLodash`.
1892 LazyWrapper.prototype = baseCreate(baseLodash.prototype);
1893 LazyWrapper.prototype.constructor = LazyWrapper;
1895 /*------------------------------------------------------------------------*/
1898 * Creates a hash object.
1902 * @param {Array} [entries] The key-value pairs to cache.
1904 function Hash(entries) {
1906 length = entries == null ? 0 : entries.length;
1909 while (++index < length) {
1910 var entry = entries[index];
1911 this.set(entry[0], entry[1]);
1916 * Removes all key-value entries from the hash.
1922 function hashClear() {
1923 this.__data__ = nativeCreate ? nativeCreate(null) : {};
1928 * Removes `key` and its value from the hash.
1933 * @param {Object} hash The hash to modify.
1934 * @param {string} key The key of the value to remove.
1935 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
1937 function hashDelete(key) {
1938 var result = this.has(key) && delete this.__data__[key];
1939 this.size -= result ? 1 : 0;
1944 * Gets the hash value for `key`.
1949 * @param {string} key The key of the value to get.
1950 * @returns {*} Returns the entry value.
1952 function hashGet(key) {
1953 var data = this.__data__;
1955 var result = data[key];
1956 return result === HASH_UNDEFINED ? undefined : result;
1958 return hasOwnProperty.call(data, key) ? data[key] : undefined;
1962 * Checks if a hash value for `key` exists.
1967 * @param {string} key The key of the entry to check.
1968 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
1970 function hashHas(key) {
1971 var data = this.__data__;
1972 return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);
1976 * Sets the hash `key` to `value`.
1981 * @param {string} key The key of the value to set.
1982 * @param {*} value The value to set.
1983 * @returns {Object} Returns the hash instance.
1985 function hashSet(key, value) {
1986 var data = this.__data__;
1987 this.size += this.has(key) ? 0 : 1;
1988 data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;
1992 // Add methods to `Hash`.
1993 Hash.prototype.clear = hashClear;
1994 Hash.prototype['delete'] = hashDelete;
1995 Hash.prototype.get = hashGet;
1996 Hash.prototype.has = hashHas;
1997 Hash.prototype.set = hashSet;
1999 /*------------------------------------------------------------------------*/
2002 * Creates an list cache object.
2006 * @param {Array} [entries] The key-value pairs to cache.
2008 function ListCache(entries) {
2010 length = entries == null ? 0 : entries.length;
2013 while (++index < length) {
2014 var entry = entries[index];
2015 this.set(entry[0], entry[1]);
2020 * Removes all key-value entries from the list cache.
2024 * @memberOf ListCache
2026 function listCacheClear() {
2032 * Removes `key` and its value from the list cache.
2036 * @memberOf ListCache
2037 * @param {string} key The key of the value to remove.
2038 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
2040 function listCacheDelete(key) {
2041 var data = this.__data__,
2042 index = assocIndexOf(data, key);
2047 var lastIndex = data.length - 1;
2048 if (index == lastIndex) {
2051 splice.call(data, index, 1);
2058 * Gets the list cache value for `key`.
2062 * @memberOf ListCache
2063 * @param {string} key The key of the value to get.
2064 * @returns {*} Returns the entry value.
2066 function listCacheGet(key) {
2067 var data = this.__data__,
2068 index = assocIndexOf(data, key);
2070 return index < 0 ? undefined : data[index][1];
2074 * Checks if a list cache value for `key` exists.
2078 * @memberOf ListCache
2079 * @param {string} key The key of the entry to check.
2080 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
2082 function listCacheHas(key) {
2083 return assocIndexOf(this.__data__, key) > -1;
2087 * Sets the list cache `key` to `value`.
2091 * @memberOf ListCache
2092 * @param {string} key The key of the value to set.
2093 * @param {*} value The value to set.
2094 * @returns {Object} Returns the list cache instance.
2096 function listCacheSet(key, value) {
2097 var data = this.__data__,
2098 index = assocIndexOf(data, key);
2102 data.push([key, value]);
2104 data[index][1] = value;
2109 // Add methods to `ListCache`.
2110 ListCache.prototype.clear = listCacheClear;
2111 ListCache.prototype['delete'] = listCacheDelete;
2112 ListCache.prototype.get = listCacheGet;
2113 ListCache.prototype.has = listCacheHas;
2114 ListCache.prototype.set = listCacheSet;
2116 /*------------------------------------------------------------------------*/
2119 * Creates a map cache object to store key-value pairs.
2123 * @param {Array} [entries] The key-value pairs to cache.
2125 function MapCache(entries) {
2127 length = entries == null ? 0 : entries.length;
2130 while (++index < length) {
2131 var entry = entries[index];
2132 this.set(entry[0], entry[1]);
2137 * Removes all key-value entries from the map.
2141 * @memberOf MapCache
2143 function mapCacheClear() {
2147 'map': new (Map || ListCache),
2153 * Removes `key` and its value from the map.
2157 * @memberOf MapCache
2158 * @param {string} key The key of the value to remove.
2159 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
2161 function mapCacheDelete(key) {
2162 var result = getMapData(this, key)['delete'](key);
2163 this.size -= result ? 1 : 0;
2168 * Gets the map value for `key`.
2172 * @memberOf MapCache
2173 * @param {string} key The key of the value to get.
2174 * @returns {*} Returns the entry value.
2176 function mapCacheGet(key) {
2177 return getMapData(this, key).get(key);
2181 * Checks if a map value for `key` exists.
2185 * @memberOf MapCache
2186 * @param {string} key The key of the entry to check.
2187 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
2189 function mapCacheHas(key) {
2190 return getMapData(this, key).has(key);
2194 * Sets the map `key` to `value`.
2198 * @memberOf MapCache
2199 * @param {string} key The key of the value to set.
2200 * @param {*} value The value to set.
2201 * @returns {Object} Returns the map cache instance.
2203 function mapCacheSet(key, value) {
2204 var data = getMapData(this, key),
2207 data.set(key, value);
2208 this.size += data.size == size ? 0 : 1;
2212 // Add methods to `MapCache`.
2213 MapCache.prototype.clear = mapCacheClear;
2214 MapCache.prototype['delete'] = mapCacheDelete;
2215 MapCache.prototype.get = mapCacheGet;
2216 MapCache.prototype.has = mapCacheHas;
2217 MapCache.prototype.set = mapCacheSet;
2219 /*------------------------------------------------------------------------*/
2223 * Creates an array cache object to store unique values.
2227 * @param {Array} [values] The values to cache.
2229 function SetCache(values) {
2231 length = values == null ? 0 : values.length;
2233 this.__data__ = new MapCache;
2234 while (++index < length) {
2235 this.add(values[index]);
2240 * Adds `value` to the array cache.
2244 * @memberOf SetCache
2246 * @param {*} value The value to cache.
2247 * @returns {Object} Returns the cache instance.
2249 function setCacheAdd(value) {
2250 this.__data__.set(value, HASH_UNDEFINED);
2255 * Checks if `value` is in the array cache.
2259 * @memberOf SetCache
2260 * @param {*} value The value to search for.
2261 * @returns {number} Returns `true` if `value` is found, else `false`.
2263 function setCacheHas(value) {
2264 return this.__data__.has(value);
2267 // Add methods to `SetCache`.
2268 SetCache.prototype.add = SetCache.prototype.push = setCacheAdd;
2269 SetCache.prototype.has = setCacheHas;
2271 /*------------------------------------------------------------------------*/
2274 * Creates a stack cache object to store key-value pairs.
2278 * @param {Array} [entries] The key-value pairs to cache.
2280 function Stack(entries) {
2281 var data = this.__data__ = new ListCache(entries);
2282 this.size = data.size;
2286 * Removes all key-value entries from the stack.
2292 function stackClear() {
2293 this.__data__ = new ListCache;
2298 * Removes `key` and its value from the stack.
2303 * @param {string} key The key of the value to remove.
2304 * @returns {boolean} Returns `true` if the entry was removed, else `false`.
2306 function stackDelete(key) {
2307 var data = this.__data__,
2308 result = data['delete'](key);
2310 this.size = data.size;
2315 * Gets the stack value for `key`.
2320 * @param {string} key The key of the value to get.
2321 * @returns {*} Returns the entry value.
2323 function stackGet(key) {
2324 return this.__data__.get(key);
2328 * Checks if a stack value for `key` exists.
2333 * @param {string} key The key of the entry to check.
2334 * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.
2336 function stackHas(key) {
2337 return this.__data__.has(key);
2341 * Sets the stack `key` to `value`.
2346 * @param {string} key The key of the value to set.
2347 * @param {*} value The value to set.
2348 * @returns {Object} Returns the stack cache instance.
2350 function stackSet(key, value) {
2351 var data = this.__data__;
2352 if (data instanceof ListCache) {
2353 var pairs = data.__data__;
2354 if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {
2355 pairs.push([key, value]);
2356 this.size = ++data.size;
2359 data = this.__data__ = new MapCache(pairs);
2361 data.set(key, value);
2362 this.size = data.size;
2366 // Add methods to `Stack`.
2367 Stack.prototype.clear = stackClear;
2368 Stack.prototype['delete'] = stackDelete;
2369 Stack.prototype.get = stackGet;
2370 Stack.prototype.has = stackHas;
2371 Stack.prototype.set = stackSet;
2373 /*------------------------------------------------------------------------*/
2376 * Creates an array of the enumerable property names of the array-like `value`.
2379 * @param {*} value The value to query.
2380 * @param {boolean} inherited Specify returning inherited property names.
2381 * @returns {Array} Returns the array of property names.
2383 function arrayLikeKeys(value, inherited) {
2384 var isArr = isArray(value),
2385 isArg = !isArr && isArguments(value),
2386 isBuff = !isArr && !isArg && isBuffer(value),
2387 isType = !isArr && !isArg && !isBuff && isTypedArray(value),
2388 skipIndexes = isArr || isArg || isBuff || isType,
2389 result = skipIndexes ? baseTimes(value.length, String) : [],
2390 length = result.length;
2392 for (var key in value) {
2393 if ((inherited || hasOwnProperty.call(value, key)) &&
2395 // Safari 9 has enumerable `arguments.length` in strict mode.
2397 // Node.js 0.10 has enumerable non-index properties on buffers.
2398 (isBuff && (key == 'offset' || key == 'parent')) ||
2399 // PhantomJS 2 has enumerable non-index properties on typed arrays.
2400 (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
2401 // Skip index properties.
2402 isIndex(key, length)
2411 * A specialized version of `_.sample` for arrays.
2414 * @param {Array} array The array to sample.
2415 * @returns {*} Returns the random element.
2417 function arraySample(array) {
2418 var length = array.length;
2419 return length ? array[baseRandom(0, length - 1)] : undefined;
2423 * A specialized version of `_.sampleSize` for arrays.
2426 * @param {Array} array The array to sample.
2427 * @param {number} n The number of elements to sample.
2428 * @returns {Array} Returns the random elements.
2430 function arraySampleSize(array, n) {
2431 return shuffleSelf(copyArray(array), baseClamp(n, 0, array.length));
2435 * A specialized version of `_.shuffle` for arrays.
2438 * @param {Array} array The array to shuffle.
2439 * @returns {Array} Returns the new shuffled array.
2441 function arrayShuffle(array) {
2442 return shuffleSelf(copyArray(array));
2446 * This function is like `assignValue` except that it doesn't assign
2447 * `undefined` values.
2450 * @param {Object} object The object to modify.
2451 * @param {string} key The key of the property to assign.
2452 * @param {*} value The value to assign.
2454 function assignMergeValue(object, key, value) {
2455 if ((value !== undefined && !eq(object[key], value)) ||
2456 (value === undefined && !(key in object))) {
2457 baseAssignValue(object, key, value);
2462 * Assigns `value` to `key` of `object` if the existing value is not equivalent
2463 * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
2464 * for equality comparisons.
2467 * @param {Object} object The object to modify.
2468 * @param {string} key The key of the property to assign.
2469 * @param {*} value The value to assign.
2471 function assignValue(object, key, value) {
2472 var objValue = object[key];
2473 if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||
2474 (value === undefined && !(key in object))) {
2475 baseAssignValue(object, key, value);
2480 * Gets the index at which the `key` is found in `array` of key-value pairs.
2483 * @param {Array} array The array to inspect.
2484 * @param {*} key The key to search for.
2485 * @returns {number} Returns the index of the matched value, else `-1`.
2487 function assocIndexOf(array, key) {
2488 var length = array.length;
2490 if (eq(array[length][0], key)) {
2498 * Aggregates elements of `collection` on `accumulator` with keys transformed
2499 * by `iteratee` and values set by `setter`.
2502 * @param {Array|Object} collection The collection to iterate over.
2503 * @param {Function} setter The function to set `accumulator` values.
2504 * @param {Function} iteratee The iteratee to transform keys.
2505 * @param {Object} accumulator The initial aggregated object.
2506 * @returns {Function} Returns `accumulator`.
2508 function baseAggregator(collection, setter, iteratee, accumulator) {
2509 baseEach(collection, function(value, key, collection) {
2510 setter(accumulator, value, iteratee(value), collection);
2516 * The base implementation of `_.assign` without support for multiple sources
2517 * or `customizer` functions.
2520 * @param {Object} object The destination object.
2521 * @param {Object} source The source object.
2522 * @returns {Object} Returns `object`.
2524 function baseAssign(object, source) {
2525 return object && copyObject(source, keys(source), object);
2529 * The base implementation of `_.assignIn` without support for multiple sources
2530 * or `customizer` functions.
2533 * @param {Object} object The destination object.
2534 * @param {Object} source The source object.
2535 * @returns {Object} Returns `object`.
2537 function baseAssignIn(object, source) {
2538 return object && copyObject(source, keysIn(source), object);
2542 * The base implementation of `assignValue` and `assignMergeValue` without
2546 * @param {Object} object The object to modify.
2547 * @param {string} key The key of the property to assign.
2548 * @param {*} value The value to assign.
2550 function baseAssignValue(object, key, value) {
2551 if (key == '__proto__' && defineProperty) {
2552 defineProperty(object, key, {
2553 'configurable': true,
2559 object[key] = value;
2564 * The base implementation of `_.at` without support for individual paths.
2567 * @param {Object} object The object to iterate over.
2568 * @param {string[]} paths The property paths to pick.
2569 * @returns {Array} Returns the picked elements.
2571 function baseAt(object, paths) {
2573 length = paths.length,
2574 result = Array(length),
2575 skip = object == null;
2577 while (++index < length) {
2578 result[index] = skip ? undefined : get(object, paths[index]);
2584 * The base implementation of `_.clamp` which doesn't coerce arguments.
2587 * @param {number} number The number to clamp.
2588 * @param {number} [lower] The lower bound.
2589 * @param {number} upper The upper bound.
2590 * @returns {number} Returns the clamped number.
2592 function baseClamp(number, lower, upper) {
2593 if (number === number) {
2594 if (upper !== undefined) {
2595 number = number <= upper ? number : upper;
2597 if (lower !== undefined) {
2598 number = number >= lower ? number : lower;
2605 * The base implementation of `_.clone` and `_.cloneDeep` which tracks
2606 * traversed objects.
2609 * @param {*} value The value to clone.
2610 * @param {boolean} bitmask The bitmask flags.
2612 * 2 - Flatten inherited properties
2614 * @param {Function} [customizer] The function to customize cloning.
2615 * @param {string} [key] The key of `value`.
2616 * @param {Object} [object] The parent object of `value`.
2617 * @param {Object} [stack] Tracks traversed objects and their clone counterparts.
2618 * @returns {*} Returns the cloned value.
2620 function baseClone(value, bitmask, customizer, key, object, stack) {
2622 isDeep = bitmask & CLONE_DEEP_FLAG,
2623 isFlat = bitmask & CLONE_FLAT_FLAG,
2624 isFull = bitmask & CLONE_SYMBOLS_FLAG;
2627 result = object ? customizer(value, key, object, stack) : customizer(value);
2629 if (result !== undefined) {
2632 if (!isObject(value)) {
2635 var isArr = isArray(value);
2637 result = initCloneArray(value);
2639 return copyArray(value, result);
2642 var tag = getTag(value),
2643 isFunc = tag == funcTag || tag == genTag;
2645 if (isBuffer(value)) {
2646 return cloneBuffer(value, isDeep);
2648 if (tag == objectTag || tag == argsTag || (isFunc && !object)) {
2649 result = (isFlat || isFunc) ? {} : initCloneObject(value);
2652 ? copySymbolsIn(value, baseAssignIn(result, value))
2653 : copySymbols(value, baseAssign(result, value));
2656 if (!cloneableTags[tag]) {
2657 return object ? value : {};
2659 result = initCloneByTag(value, tag, isDeep);
2662 // Check for circular references and return its corresponding clone.
2663 stack || (stack = new Stack);
2664 var stacked = stack.get(value);
2668 stack.set(value, result);
2671 value.forEach(function(subValue) {
2672 result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));
2674 } else if (isMap(value)) {
2675 value.forEach(function(subValue, key) {
2676 result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));
2680 var keysFunc = isFull
2681 ? (isFlat ? getAllKeysIn : getAllKeys)
2682 : (isFlat ? keysIn : keys);
2684 var props = isArr ? undefined : keysFunc(value);
2685 arrayEach(props || value, function(subValue, key) {
2688 subValue = value[key];
2690 // Recursively populate clone (susceptible to call stack limits).
2691 assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));
2697 * The base implementation of `_.conforms` which doesn't clone `source`.
2700 * @param {Object} source The object of property predicates to conform to.
2701 * @returns {Function} Returns the new spec function.
2703 function baseConforms(source) {
2704 var props = keys(source);
2705 return function(object) {
2706 return baseConformsTo(object, source, props);
2711 * The base implementation of `_.conformsTo` which accepts `props` to check.
2714 * @param {Object} object The object to inspect.
2715 * @param {Object} source The object of property predicates to conform to.
2716 * @returns {boolean} Returns `true` if `object` conforms, else `false`.
2718 function baseConformsTo(object, source, props) {
2719 var length = props.length;
2720 if (object == null) {
2723 object = Object(object);
2725 var key = props[length],
2726 predicate = source[key],
2727 value = object[key];
2729 if ((value === undefined && !(key in object)) || !predicate(value)) {
2737 * The base implementation of `_.delay` and `_.defer` which accepts `args`
2738 * to provide to `func`.
2741 * @param {Function} func The function to delay.
2742 * @param {number} wait The number of milliseconds to delay invocation.
2743 * @param {Array} args The arguments to provide to `func`.
2744 * @returns {number|Object} Returns the timer id or timeout object.
2746 function baseDelay(func, wait, args) {
2747 if (typeof func != 'function') {
2748 throw new TypeError(FUNC_ERROR_TEXT);
2750 return setTimeout(function() { func.apply(undefined, args); }, wait);
2754 * The base implementation of methods like `_.difference` without support
2755 * for excluding multiple arrays or iteratee shorthands.
2758 * @param {Array} array The array to inspect.
2759 * @param {Array} values The values to exclude.
2760 * @param {Function} [iteratee] The iteratee invoked per element.
2761 * @param {Function} [comparator] The comparator invoked per element.
2762 * @returns {Array} Returns the new array of filtered values.
2764 function baseDifference(array, values, iteratee, comparator) {
2766 includes = arrayIncludes,
2768 length = array.length,
2770 valuesLength = values.length;
2776 values = arrayMap(values, baseUnary(iteratee));
2779 includes = arrayIncludesWith;
2782 else if (values.length >= LARGE_ARRAY_SIZE) {
2783 includes = cacheHas;
2785 values = new SetCache(values);
2788 while (++index < length) {
2789 var value = array[index],
2790 computed = iteratee == null ? value : iteratee(value);
2792 value = (comparator || value !== 0) ? value : 0;
2793 if (isCommon && computed === computed) {
2794 var valuesIndex = valuesLength;
2795 while (valuesIndex--) {
2796 if (values[valuesIndex] === computed) {
2802 else if (!includes(values, computed, comparator)) {
2810 * The base implementation of `_.forEach` without support for iteratee shorthands.
2813 * @param {Array|Object} collection The collection to iterate over.
2814 * @param {Function} iteratee The function invoked per iteration.
2815 * @returns {Array|Object} Returns `collection`.
2817 var baseEach = createBaseEach(baseForOwn);
2820 * The base implementation of `_.forEachRight` without support for iteratee shorthands.
2823 * @param {Array|Object} collection The collection to iterate over.
2824 * @param {Function} iteratee The function invoked per iteration.
2825 * @returns {Array|Object} Returns `collection`.
2827 var baseEachRight = createBaseEach(baseForOwnRight, true);
2830 * The base implementation of `_.every` without support for iteratee shorthands.
2833 * @param {Array|Object} collection The collection to iterate over.
2834 * @param {Function} predicate The function invoked per iteration.
2835 * @returns {boolean} Returns `true` if all elements pass the predicate check,
2838 function baseEvery(collection, predicate) {
2840 baseEach(collection, function(value, index, collection) {
2841 result = !!predicate(value, index, collection);
2848 * The base implementation of methods like `_.max` and `_.min` which accepts a
2849 * `comparator` to determine the extremum value.
2852 * @param {Array} array The array to iterate over.
2853 * @param {Function} iteratee The iteratee invoked per iteration.
2854 * @param {Function} comparator The comparator used to compare values.
2855 * @returns {*} Returns the extremum value.
2857 function baseExtremum(array, iteratee, comparator) {
2859 length = array.length;
2861 while (++index < length) {
2862 var value = array[index],
2863 current = iteratee(value);
2865 if (current != null && (computed === undefined
2866 ? (current === current && !isSymbol(current))
2867 : comparator(current, computed)
2869 var computed = current,
2877 * The base implementation of `_.fill` without an iteratee call guard.
2880 * @param {Array} array The array to fill.
2881 * @param {*} value The value to fill `array` with.
2882 * @param {number} [start=0] The start position.
2883 * @param {number} [end=array.length] The end position.
2884 * @returns {Array} Returns `array`.
2886 function baseFill(array, value, start, end) {
2887 var length = array.length;
2889 start = toInteger(start);
2891 start = -start > length ? 0 : (length + start);
2893 end = (end === undefined || end > length) ? length : toInteger(end);
2897 end = start > end ? 0 : toLength(end);
2898 while (start < end) {
2899 array[start++] = value;
2905 * The base implementation of `_.filter` without support for iteratee shorthands.
2908 * @param {Array|Object} collection The collection to iterate over.
2909 * @param {Function} predicate The function invoked per iteration.
2910 * @returns {Array} Returns the new filtered array.
2912 function baseFilter(collection, predicate) {
2914 baseEach(collection, function(value, index, collection) {
2915 if (predicate(value, index, collection)) {
2923 * The base implementation of `_.flatten` with support for restricting flattening.
2926 * @param {Array} array The array to flatten.
2927 * @param {number} depth The maximum recursion depth.
2928 * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.
2929 * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.
2930 * @param {Array} [result=[]] The initial result value.
2931 * @returns {Array} Returns the new flattened array.
2933 function baseFlatten(array, depth, predicate, isStrict, result) {
2935 length = array.length;
2937 predicate || (predicate = isFlattenable);
2938 result || (result = []);
2940 while (++index < length) {
2941 var value = array[index];
2942 if (depth > 0 && predicate(value)) {
2944 // Recursively flatten arrays (susceptible to call stack limits).
2945 baseFlatten(value, depth - 1, predicate, isStrict, result);
2947 arrayPush(result, value);
2949 } else if (!isStrict) {
2950 result[result.length] = value;
2957 * The base implementation of `baseForOwn` which iterates over `object`
2958 * properties returned by `keysFunc` and invokes `iteratee` for each property.
2959 * Iteratee functions may exit iteration early by explicitly returning `false`.
2962 * @param {Object} object The object to iterate over.
2963 * @param {Function} iteratee The function invoked per iteration.
2964 * @param {Function} keysFunc The function to get the keys of `object`.
2965 * @returns {Object} Returns `object`.
2967 var baseFor = createBaseFor();
2970 * This function is like `baseFor` except that it iterates over properties
2971 * in the opposite order.
2974 * @param {Object} object The object to iterate over.
2975 * @param {Function} iteratee The function invoked per iteration.
2976 * @param {Function} keysFunc The function to get the keys of `object`.
2977 * @returns {Object} Returns `object`.
2979 var baseForRight = createBaseFor(true);
2982 * The base implementation of `_.forOwn` without support for iteratee shorthands.
2985 * @param {Object} object The object to iterate over.
2986 * @param {Function} iteratee The function invoked per iteration.
2987 * @returns {Object} Returns `object`.
2989 function baseForOwn(object, iteratee) {
2990 return object && baseFor(object, iteratee, keys);
2994 * The base implementation of `_.forOwnRight` without support for iteratee shorthands.
2997 * @param {Object} object The object to iterate over.
2998 * @param {Function} iteratee The function invoked per iteration.
2999 * @returns {Object} Returns `object`.
3001 function baseForOwnRight(object, iteratee) {
3002 return object && baseForRight(object, iteratee, keys);
3006 * The base implementation of `_.functions` which creates an array of
3007 * `object` function property names filtered from `props`.
3010 * @param {Object} object The object to inspect.
3011 * @param {Array} props The property names to filter.
3012 * @returns {Array} Returns the function names.
3014 function baseFunctions(object, props) {
3015 return arrayFilter(props, function(key) {
3016 return isFunction(object[key]);
3021 * The base implementation of `_.get` without support for default values.
3024 * @param {Object} object The object to query.
3025 * @param {Array|string} path The path of the property to get.
3026 * @returns {*} Returns the resolved value.
3028 function baseGet(object, path) {
3029 path = castPath(path, object);
3032 length = path.length;
3034 while (object != null && index < length) {
3035 object = object[toKey(path[index++])];
3037 return (index && index == length) ? object : undefined;
3041 * The base implementation of `getAllKeys` and `getAllKeysIn` which uses
3042 * `keysFunc` and `symbolsFunc` to get the enumerable property names and
3043 * symbols of `object`.
3046 * @param {Object} object The object to query.
3047 * @param {Function} keysFunc The function to get the keys of `object`.
3048 * @param {Function} symbolsFunc The function to get the symbols of `object`.
3049 * @returns {Array} Returns the array of property names and symbols.
3051 function baseGetAllKeys(object, keysFunc, symbolsFunc) {
3052 var result = keysFunc(object);
3053 return isArray(object) ? result : arrayPush(result, symbolsFunc(object));
3057 * The base implementation of `getTag` without fallbacks for buggy environments.
3060 * @param {*} value The value to query.
3061 * @returns {string} Returns the `toStringTag`.
3063 function baseGetTag(value) {
3064 if (value == null) {
3065 return value === undefined ? undefinedTag : nullTag;
3067 return (symToStringTag && symToStringTag in Object(value))
3069 : objectToString(value);
3073 * The base implementation of `_.gt` which doesn't coerce arguments.
3076 * @param {*} value The value to compare.
3077 * @param {*} other The other value to compare.
3078 * @returns {boolean} Returns `true` if `value` is greater than `other`,
3081 function baseGt(value, other) {
3082 return value > other;
3086 * The base implementation of `_.has` without support for deep paths.
3089 * @param {Object} [object] The object to query.
3090 * @param {Array|string} key The key to check.
3091 * @returns {boolean} Returns `true` if `key` exists, else `false`.
3093 function baseHas(object, key) {
3094 return object != null && hasOwnProperty.call(object, key);
3098 * The base implementation of `_.hasIn` without support for deep paths.
3101 * @param {Object} [object] The object to query.
3102 * @param {Array|string} key The key to check.
3103 * @returns {boolean} Returns `true` if `key` exists, else `false`.
3105 function baseHasIn(object, key) {
3106 return object != null && key in Object(object);
3110 * The base implementation of `_.inRange` which doesn't coerce arguments.
3113 * @param {number} number The number to check.
3114 * @param {number} start The start of the range.
3115 * @param {number} end The end of the range.
3116 * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
3118 function baseInRange(number, start, end) {
3119 return number >= nativeMin(start, end) && number < nativeMax(start, end);
3123 * The base implementation of methods like `_.intersection`, without support
3124 * for iteratee shorthands, that accepts an array of arrays to inspect.
3127 * @param {Array} arrays The arrays to inspect.
3128 * @param {Function} [iteratee] The iteratee invoked per element.
3129 * @param {Function} [comparator] The comparator invoked per element.
3130 * @returns {Array} Returns the new array of shared values.
3132 function baseIntersection(arrays, iteratee, comparator) {
3133 var includes = comparator ? arrayIncludesWith : arrayIncludes,
3134 length = arrays[0].length,
3135 othLength = arrays.length,
3136 othIndex = othLength,
3137 caches = Array(othLength),
3138 maxLength = Infinity,
3141 while (othIndex--) {
3142 var array = arrays[othIndex];
3143 if (othIndex && iteratee) {
3144 array = arrayMap(array, baseUnary(iteratee));
3146 maxLength = nativeMin(array.length, maxLength);
3147 caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))
3148 ? new SetCache(othIndex && array)
3157 while (++index < length && result.length < maxLength) {
3158 var value = array[index],
3159 computed = iteratee ? iteratee(value) : value;
3161 value = (comparator || value !== 0) ? value : 0;
3163 ? cacheHas(seen, computed)
3164 : includes(result, computed, comparator)
3166 othIndex = othLength;
3167 while (--othIndex) {
3168 var cache = caches[othIndex];
3170 ? cacheHas(cache, computed)
3171 : includes(arrays[othIndex], computed, comparator))
3177 seen.push(computed);
3186 * The base implementation of `_.invert` and `_.invertBy` which inverts
3187 * `object` with values transformed by `iteratee` and set by `setter`.
3190 * @param {Object} object The object to iterate over.
3191 * @param {Function} setter The function to set `accumulator` values.
3192 * @param {Function} iteratee The iteratee to transform values.
3193 * @param {Object} accumulator The initial inverted object.
3194 * @returns {Function} Returns `accumulator`.
3196 function baseInverter(object, setter, iteratee, accumulator) {
3197 baseForOwn(object, function(value, key, object) {
3198 setter(accumulator, iteratee(value), key, object);
3204 * The base implementation of `_.invoke` without support for individual
3208 * @param {Object} object The object to query.
3209 * @param {Array|string} path The path of the method to invoke.
3210 * @param {Array} args The arguments to invoke the method with.
3211 * @returns {*} Returns the result of the invoked method.
3213 function baseInvoke(object, path, args) {
3214 path = castPath(path, object);
3215 object = parent(object, path);
3216 var func = object == null ? object : object[toKey(last(path))];
3217 return func == null ? undefined : apply(func, object, args);
3221 * The base implementation of `_.isArguments`.
3224 * @param {*} value The value to check.
3225 * @returns {boolean} Returns `true` if `value` is an `arguments` object,
3227 function baseIsArguments(value) {
3228 return isObjectLike(value) && baseGetTag(value) == argsTag;
3232 * The base implementation of `_.isArrayBuffer` without Node.js optimizations.
3235 * @param {*} value The value to check.
3236 * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
3238 function baseIsArrayBuffer(value) {
3239 return isObjectLike(value) && baseGetTag(value) == arrayBufferTag;
3243 * The base implementation of `_.isDate` without Node.js optimizations.
3246 * @param {*} value The value to check.
3247 * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
3249 function baseIsDate(value) {
3250 return isObjectLike(value) && baseGetTag(value) == dateTag;
3254 * The base implementation of `_.isEqual` which supports partial comparisons
3255 * and tracks traversed objects.
3258 * @param {*} value The value to compare.
3259 * @param {*} other The other value to compare.
3260 * @param {boolean} bitmask The bitmask flags.
3261 * 1 - Unordered comparison
3262 * 2 - Partial comparison
3263 * @param {Function} [customizer] The function to customize comparisons.
3264 * @param {Object} [stack] Tracks traversed `value` and `other` objects.
3265 * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
3267 function baseIsEqual(value, other, bitmask, customizer, stack) {
3268 if (value === other) {
3271 if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {
3272 return value !== value && other !== other;
3274 return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);
3278 * A specialized version of `baseIsEqual` for arrays and objects which performs
3279 * deep comparisons and tracks traversed objects enabling objects with circular
3280 * references to be compared.
3283 * @param {Object} object The object to compare.
3284 * @param {Object} other The other object to compare.
3285 * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
3286 * @param {Function} customizer The function to customize comparisons.
3287 * @param {Function} equalFunc The function to determine equivalents of values.
3288 * @param {Object} [stack] Tracks traversed `object` and `other` objects.
3289 * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
3291 function baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {
3292 var objIsArr = isArray(object),
3293 othIsArr = isArray(other),
3294 objTag = objIsArr ? arrayTag : getTag(object),
3295 othTag = othIsArr ? arrayTag : getTag(other);
3297 objTag = objTag == argsTag ? objectTag : objTag;
3298 othTag = othTag == argsTag ? objectTag : othTag;
3300 var objIsObj = objTag == objectTag,
3301 othIsObj = othTag == objectTag,
3302 isSameTag = objTag == othTag;
3304 if (isSameTag && isBuffer(object)) {
3305 if (!isBuffer(other)) {
3311 if (isSameTag && !objIsObj) {
3312 stack || (stack = new Stack);
3313 return (objIsArr || isTypedArray(object))
3314 ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)
3315 : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);
3317 if (!(bitmask & COMPARE_PARTIAL_FLAG)) {
3318 var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),
3319 othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');
3321 if (objIsWrapped || othIsWrapped) {
3322 var objUnwrapped = objIsWrapped ? object.value() : object,
3323 othUnwrapped = othIsWrapped ? other.value() : other;
3325 stack || (stack = new Stack);
3326 return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);
3332 stack || (stack = new Stack);
3333 return equalObjects(object, other, bitmask, customizer, equalFunc, stack);
3337 * The base implementation of `_.isMap` without Node.js optimizations.
3340 * @param {*} value The value to check.
3341 * @returns {boolean} Returns `true` if `value` is a map, else `false`.
3343 function baseIsMap(value) {
3344 return isObjectLike(value) && getTag(value) == mapTag;
3348 * The base implementation of `_.isMatch` without support for iteratee shorthands.
3351 * @param {Object} object The object to inspect.
3352 * @param {Object} source The object of property values to match.
3353 * @param {Array} matchData The property names, values, and compare flags to match.
3354 * @param {Function} [customizer] The function to customize comparisons.
3355 * @returns {boolean} Returns `true` if `object` is a match, else `false`.
3357 function baseIsMatch(object, source, matchData, customizer) {
3358 var index = matchData.length,
3360 noCustomizer = !customizer;
3362 if (object == null) {
3365 object = Object(object);
3367 var data = matchData[index];
3368 if ((noCustomizer && data[2])
3369 ? data[1] !== object[data[0]]
3370 : !(data[0] in object)
3375 while (++index < length) {
3376 data = matchData[index];
3378 objValue = object[key],
3381 if (noCustomizer && data[2]) {
3382 if (objValue === undefined && !(key in object)) {
3386 var stack = new Stack;
3388 var result = customizer(objValue, srcValue, key, object, source, stack);
3390 if (!(result === undefined
3391 ? baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG, customizer, stack)
3402 * The base implementation of `_.isNative` without bad shim checks.
3405 * @param {*} value The value to check.
3406 * @returns {boolean} Returns `true` if `value` is a native function,
3409 function baseIsNative(value) {
3410 if (!isObject(value) || isMasked(value)) {
3413 var pattern = isFunction(value) ? reIsNative : reIsHostCtor;
3414 return pattern.test(toSource(value));
3418 * The base implementation of `_.isRegExp` without Node.js optimizations.
3421 * @param {*} value The value to check.
3422 * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
3424 function baseIsRegExp(value) {
3425 return isObjectLike(value) && baseGetTag(value) == regexpTag;
3429 * The base implementation of `_.isSet` without Node.js optimizations.
3432 * @param {*} value The value to check.
3433 * @returns {boolean} Returns `true` if `value` is a set, else `false`.
3435 function baseIsSet(value) {
3436 return isObjectLike(value) && getTag(value) == setTag;
3440 * The base implementation of `_.isTypedArray` without Node.js optimizations.
3443 * @param {*} value The value to check.
3444 * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
3446 function baseIsTypedArray(value) {
3447 return isObjectLike(value) &&
3448 isLength(value.length) && !!typedArrayTags[baseGetTag(value)];
3452 * The base implementation of `_.iteratee`.
3455 * @param {*} [value=_.identity] The value to convert to an iteratee.
3456 * @returns {Function} Returns the iteratee.
3458 function baseIteratee(value) {
3459 // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.
3460 // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.
3461 if (typeof value == 'function') {
3464 if (value == null) {
3467 if (typeof value == 'object') {
3468 return isArray(value)
3469 ? baseMatchesProperty(value[0], value[1])
3470 : baseMatches(value);
3472 return property(value);
3476 * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.
3479 * @param {Object} object The object to query.
3480 * @returns {Array} Returns the array of property names.
3482 function baseKeys(object) {
3483 if (!isPrototype(object)) {
3484 return nativeKeys(object);
3487 for (var key in Object(object)) {
3488 if (hasOwnProperty.call(object, key) && key != 'constructor') {
3496 * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.
3499 * @param {Object} object The object to query.
3500 * @returns {Array} Returns the array of property names.
3502 function baseKeysIn(object) {
3503 if (!isObject(object)) {
3504 return nativeKeysIn(object);
3506 var isProto = isPrototype(object),
3509 for (var key in object) {
3510 if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {
3518 * The base implementation of `_.lt` which doesn't coerce arguments.
3521 * @param {*} value The value to compare.
3522 * @param {*} other The other value to compare.
3523 * @returns {boolean} Returns `true` if `value` is less than `other`,
3526 function baseLt(value, other) {
3527 return value < other;
3531 * The base implementation of `_.map` without support for iteratee shorthands.
3534 * @param {Array|Object} collection The collection to iterate over.
3535 * @param {Function} iteratee The function invoked per iteration.
3536 * @returns {Array} Returns the new mapped array.
3538 function baseMap(collection, iteratee) {
3540 result = isArrayLike(collection) ? Array(collection.length) : [];
3542 baseEach(collection, function(value, key, collection) {
3543 result[++index] = iteratee(value, key, collection);
3549 * The base implementation of `_.matches` which doesn't clone `source`.
3552 * @param {Object} source The object of property values to match.
3553 * @returns {Function} Returns the new spec function.
3555 function baseMatches(source) {
3556 var matchData = getMatchData(source);
3557 if (matchData.length == 1 && matchData[0][2]) {
3558 return matchesStrictComparable(matchData[0][0], matchData[0][1]);
3560 return function(object) {
3561 return object === source || baseIsMatch(object, source, matchData);
3566 * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.
3569 * @param {string} path The path of the property to get.
3570 * @param {*} srcValue The value to match.
3571 * @returns {Function} Returns the new spec function.
3573 function baseMatchesProperty(path, srcValue) {
3574 if (isKey(path) && isStrictComparable(srcValue)) {
3575 return matchesStrictComparable(toKey(path), srcValue);
3577 return function(object) {
3578 var objValue = get(object, path);
3579 return (objValue === undefined && objValue === srcValue)
3580 ? hasIn(object, path)
3581 : baseIsEqual(srcValue, objValue, COMPARE_PARTIAL_FLAG | COMPARE_UNORDERED_FLAG);
3586 * The base implementation of `_.merge` without support for multiple sources.
3589 * @param {Object} object The destination object.
3590 * @param {Object} source The source object.
3591 * @param {number} srcIndex The index of `source`.
3592 * @param {Function} [customizer] The function to customize merged values.
3593 * @param {Object} [stack] Tracks traversed source values and their merged
3596 function baseMerge(object, source, srcIndex, customizer, stack) {
3597 if (object === source) {
3600 baseFor(source, function(srcValue, key) {
3601 stack || (stack = new Stack);
3602 if (isObject(srcValue)) {
3603 baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);
3606 var newValue = customizer
3607 ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)
3610 if (newValue === undefined) {
3611 newValue = srcValue;
3613 assignMergeValue(object, key, newValue);
3619 * A specialized version of `baseMerge` for arrays and objects which performs
3620 * deep merges and tracks traversed objects enabling objects with circular
3621 * references to be merged.
3624 * @param {Object} object The destination object.
3625 * @param {Object} source The source object.
3626 * @param {string} key The key of the value to merge.
3627 * @param {number} srcIndex The index of `source`.
3628 * @param {Function} mergeFunc The function to merge values.
3629 * @param {Function} [customizer] The function to customize assigned values.
3630 * @param {Object} [stack] Tracks traversed source values and their merged
3633 function baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {
3634 var objValue = safeGet(object, key),
3635 srcValue = safeGet(source, key),
3636 stacked = stack.get(srcValue);
3639 assignMergeValue(object, key, stacked);
3642 var newValue = customizer
3643 ? customizer(objValue, srcValue, (key + ''), object, source, stack)
3646 var isCommon = newValue === undefined;
3649 var isArr = isArray(srcValue),
3650 isBuff = !isArr && isBuffer(srcValue),
3651 isTyped = !isArr && !isBuff && isTypedArray(srcValue);
3653 newValue = srcValue;
3654 if (isArr || isBuff || isTyped) {
3655 if (isArray(objValue)) {
3656 newValue = objValue;
3658 else if (isArrayLikeObject(objValue)) {
3659 newValue = copyArray(objValue);
3663 newValue = cloneBuffer(srcValue, true);
3667 newValue = cloneTypedArray(srcValue, true);
3673 else if (isPlainObject(srcValue) || isArguments(srcValue)) {
3674 newValue = objValue;
3675 if (isArguments(objValue)) {
3676 newValue = toPlainObject(objValue);
3678 else if (!isObject(objValue) || isFunction(objValue)) {
3679 newValue = initCloneObject(srcValue);
3687 // Recursively merge objects and arrays (susceptible to call stack limits).
3688 stack.set(srcValue, newValue);
3689 mergeFunc(newValue, srcValue, srcIndex, customizer, stack);
3690 stack['delete'](srcValue);
3692 assignMergeValue(object, key, newValue);
3696 * The base implementation of `_.nth` which doesn't coerce arguments.
3699 * @param {Array} array The array to query.
3700 * @param {number} n The index of the element to return.
3701 * @returns {*} Returns the nth element of `array`.
3703 function baseNth(array, n) {
3704 var length = array.length;
3708 n += n < 0 ? length : 0;
3709 return isIndex(n, length) ? array[n] : undefined;
3713 * The base implementation of `_.orderBy` without param guards.
3716 * @param {Array|Object} collection The collection to iterate over.
3717 * @param {Function[]|Object[]|string[]} iteratees The iteratees to sort by.
3718 * @param {string[]} orders The sort orders of `iteratees`.
3719 * @returns {Array} Returns the new sorted array.
3721 function baseOrderBy(collection, iteratees, orders) {
3722 if (iteratees.length) {
3723 iteratees = arrayMap(iteratees, function(iteratee) {
3724 if (isArray(iteratee)) {
3725 return function(value) {
3726 return baseGet(value, iteratee.length === 1 ? iteratee[0] : iteratee);
3732 iteratees = [identity];
3736 iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
3738 var result = baseMap(collection, function(value, key, collection) {
3739 var criteria = arrayMap(iteratees, function(iteratee) {
3740 return iteratee(value);
3742 return { 'criteria': criteria, 'index': ++index, 'value': value };
3745 return baseSortBy(result, function(object, other) {
3746 return compareMultiple(object, other, orders);
3751 * The base implementation of `_.pick` without support for individual
3752 * property identifiers.
3755 * @param {Object} object The source object.
3756 * @param {string[]} paths The property paths to pick.
3757 * @returns {Object} Returns the new object.
3759 function basePick(object, paths) {
3760 return basePickBy(object, paths, function(value, path) {
3761 return hasIn(object, path);
3766 * The base implementation of `_.pickBy` without support for iteratee shorthands.
3769 * @param {Object} object The source object.
3770 * @param {string[]} paths The property paths to pick.
3771 * @param {Function} predicate The function invoked per property.
3772 * @returns {Object} Returns the new object.
3774 function basePickBy(object, paths, predicate) {
3776 length = paths.length,
3779 while (++index < length) {
3780 var path = paths[index],
3781 value = baseGet(object, path);
3783 if (predicate(value, path)) {
3784 baseSet(result, castPath(path, object), value);
3791 * A specialized version of `baseProperty` which supports deep paths.
3794 * @param {Array|string} path The path of the property to get.
3795 * @returns {Function} Returns the new accessor function.
3797 function basePropertyDeep(path) {
3798 return function(object) {
3799 return baseGet(object, path);
3804 * The base implementation of `_.pullAllBy` without support for iteratee
3808 * @param {Array} array The array to modify.
3809 * @param {Array} values The values to remove.
3810 * @param {Function} [iteratee] The iteratee invoked per element.
3811 * @param {Function} [comparator] The comparator invoked per element.
3812 * @returns {Array} Returns `array`.
3814 function basePullAll(array, values, iteratee, comparator) {
3815 var indexOf = comparator ? baseIndexOfWith : baseIndexOf,
3817 length = values.length,
3820 if (array === values) {
3821 values = copyArray(values);
3824 seen = arrayMap(array, baseUnary(iteratee));
3826 while (++index < length) {
3828 value = values[index],
3829 computed = iteratee ? iteratee(value) : value;
3831 while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {
3832 if (seen !== array) {
3833 splice.call(seen, fromIndex, 1);
3835 splice.call(array, fromIndex, 1);
3842 * The base implementation of `_.pullAt` without support for individual
3843 * indexes or capturing the removed elements.
3846 * @param {Array} array The array to modify.
3847 * @param {number[]} indexes The indexes of elements to remove.
3848 * @returns {Array} Returns `array`.
3850 function basePullAt(array, indexes) {
3851 var length = array ? indexes.length : 0,
3852 lastIndex = length - 1;
3855 var index = indexes[length];
3856 if (length == lastIndex || index !== previous) {
3857 var previous = index;
3858 if (isIndex(index)) {
3859 splice.call(array, index, 1);
3861 baseUnset(array, index);
3869 * The base implementation of `_.random` without support for returning
3870 * floating-point numbers.
3873 * @param {number} lower The lower bound.
3874 * @param {number} upper The upper bound.
3875 * @returns {number} Returns the random number.
3877 function baseRandom(lower, upper) {
3878 return lower + nativeFloor(nativeRandom() * (upper - lower + 1));
3882 * The base implementation of `_.range` and `_.rangeRight` which doesn't
3886 * @param {number} start The start of the range.
3887 * @param {number} end The end of the range.
3888 * @param {number} step The value to increment or decrement by.
3889 * @param {boolean} [fromRight] Specify iterating from right to left.
3890 * @returns {Array} Returns the range of numbers.
3892 function baseRange(start, end, step, fromRight) {
3894 length = nativeMax(nativeCeil((end - start) / (step || 1)), 0),
3895 result = Array(length);
3898 result[fromRight ? length : ++index] = start;
3905 * The base implementation of `_.repeat` which doesn't coerce arguments.
3908 * @param {string} string The string to repeat.
3909 * @param {number} n The number of times to repeat the string.
3910 * @returns {string} Returns the repeated string.
3912 function baseRepeat(string, n) {
3914 if (!string || n < 1 || n > MAX_SAFE_INTEGER) {
3917 // Leverage the exponentiation by squaring algorithm for a faster repeat.
3918 // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details.
3923 n = nativeFloor(n / 2);
3933 * The base implementation of `_.rest` which doesn't validate or coerce arguments.
3936 * @param {Function} func The function to apply a rest parameter to.
3937 * @param {number} [start=func.length-1] The start position of the rest parameter.
3938 * @returns {Function} Returns the new function.
3940 function baseRest(func, start) {
3941 return setToString(overRest(func, start, identity), func + '');
3945 * The base implementation of `_.sample`.
3948 * @param {Array|Object} collection The collection to sample.
3949 * @returns {*} Returns the random element.
3951 function baseSample(collection) {
3952 return arraySample(values(collection));
3956 * The base implementation of `_.sampleSize` without param guards.
3959 * @param {Array|Object} collection The collection to sample.
3960 * @param {number} n The number of elements to sample.
3961 * @returns {Array} Returns the random elements.
3963 function baseSampleSize(collection, n) {
3964 var array = values(collection);
3965 return shuffleSelf(array, baseClamp(n, 0, array.length));
3969 * The base implementation of `_.set`.
3972 * @param {Object} object The object to modify.
3973 * @param {Array|string} path The path of the property to set.
3974 * @param {*} value The value to set.
3975 * @param {Function} [customizer] The function to customize path creation.
3976 * @returns {Object} Returns `object`.
3978 function baseSet(object, path, value, customizer) {
3979 if (!isObject(object)) {
3982 path = castPath(path, object);
3985 length = path.length,
3986 lastIndex = length - 1,
3989 while (nested != null && ++index < length) {
3990 var key = toKey(path[index]),
3993 if (key === '__proto__' || key === 'constructor' || key === 'prototype') {
3997 if (index != lastIndex) {
3998 var objValue = nested[key];
3999 newValue = customizer ? customizer(objValue, key, nested) : undefined;
4000 if (newValue === undefined) {
4001 newValue = isObject(objValue)
4003 : (isIndex(path[index + 1]) ? [] : {});
4006 assignValue(nested, key, newValue);
4007 nested = nested[key];
4013 * The base implementation of `setData` without support for hot loop shorting.
4016 * @param {Function} func The function to associate metadata with.
4017 * @param {*} data The metadata.
4018 * @returns {Function} Returns `func`.
4020 var baseSetData = !metaMap ? identity : function(func, data) {
4021 metaMap.set(func, data);
4026 * The base implementation of `setToString` without support for hot loop shorting.
4029 * @param {Function} func The function to modify.
4030 * @param {Function} string The `toString` result.
4031 * @returns {Function} Returns `func`.
4033 var baseSetToString = !defineProperty ? identity : function(func, string) {
4034 return defineProperty(func, 'toString', {
4035 'configurable': true,
4036 'enumerable': false,
4037 'value': constant(string),
4043 * The base implementation of `_.shuffle`.
4046 * @param {Array|Object} collection The collection to shuffle.
4047 * @returns {Array} Returns the new shuffled array.
4049 function baseShuffle(collection) {
4050 return shuffleSelf(values(collection));
4054 * The base implementation of `_.slice` without an iteratee call guard.
4057 * @param {Array} array The array to slice.
4058 * @param {number} [start=0] The start position.
4059 * @param {number} [end=array.length] The end position.
4060 * @returns {Array} Returns the slice of `array`.
4062 function baseSlice(array, start, end) {
4064 length = array.length;
4067 start = -start > length ? 0 : (length + start);
4069 end = end > length ? length : end;
4073 length = start > end ? 0 : ((end - start) >>> 0);
4076 var result = Array(length);
4077 while (++index < length) {
4078 result[index] = array[index + start];
4084 * The base implementation of `_.some` without support for iteratee shorthands.
4087 * @param {Array|Object} collection The collection to iterate over.
4088 * @param {Function} predicate The function invoked per iteration.
4089 * @returns {boolean} Returns `true` if any element passes the predicate check,
4092 function baseSome(collection, predicate) {
4095 baseEach(collection, function(value, index, collection) {
4096 result = predicate(value, index, collection);
4103 * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which
4104 * performs a binary search of `array` to determine the index at which `value`
4105 * should be inserted into `array` in order to maintain its sort order.
4108 * @param {Array} array The sorted array to inspect.
4109 * @param {*} value The value to evaluate.
4110 * @param {boolean} [retHighest] Specify returning the highest qualified index.
4111 * @returns {number} Returns the index at which `value` should be inserted
4114 function baseSortedIndex(array, value, retHighest) {
4116 high = array == null ? low : array.length;
4118 if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {
4119 while (low < high) {
4120 var mid = (low + high) >>> 1,
4121 computed = array[mid];
4123 if (computed !== null && !isSymbol(computed) &&
4124 (retHighest ? (computed <= value) : (computed < value))) {
4132 return baseSortedIndexBy(array, value, identity, retHighest);
4136 * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`
4137 * which invokes `iteratee` for `value` and each element of `array` to compute
4138 * their sort ranking. The iteratee is invoked with one argument; (value).
4141 * @param {Array} array The sorted array to inspect.
4142 * @param {*} value The value to evaluate.
4143 * @param {Function} iteratee The iteratee invoked per element.
4144 * @param {boolean} [retHighest] Specify returning the highest qualified index.
4145 * @returns {number} Returns the index at which `value` should be inserted
4148 function baseSortedIndexBy(array, value, iteratee, retHighest) {
4150 high = array == null ? 0 : array.length;
4155 value = iteratee(value);
4156 var valIsNaN = value !== value,
4157 valIsNull = value === null,
4158 valIsSymbol = isSymbol(value),
4159 valIsUndefined = value === undefined;
4161 while (low < high) {
4162 var mid = nativeFloor((low + high) / 2),
4163 computed = iteratee(array[mid]),
4164 othIsDefined = computed !== undefined,
4165 othIsNull = computed === null,
4166 othIsReflexive = computed === computed,
4167 othIsSymbol = isSymbol(computed);
4170 var setLow = retHighest || othIsReflexive;
4171 } else if (valIsUndefined) {
4172 setLow = othIsReflexive && (retHighest || othIsDefined);
4173 } else if (valIsNull) {
4174 setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);
4175 } else if (valIsSymbol) {
4176 setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);
4177 } else if (othIsNull || othIsSymbol) {
4180 setLow = retHighest ? (computed <= value) : (computed < value);
4188 return nativeMin(high, MAX_ARRAY_INDEX);
4192 * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without
4193 * support for iteratee shorthands.
4196 * @param {Array} array The array to inspect.
4197 * @param {Function} [iteratee] The iteratee invoked per element.
4198 * @returns {Array} Returns the new duplicate free array.
4200 function baseSortedUniq(array, iteratee) {
4202 length = array.length,
4206 while (++index < length) {
4207 var value = array[index],
4208 computed = iteratee ? iteratee(value) : value;
4210 if (!index || !eq(computed, seen)) {
4211 var seen = computed;
4212 result[resIndex++] = value === 0 ? 0 : value;
4219 * The base implementation of `_.toNumber` which doesn't ensure correct
4220 * conversions of binary, hexadecimal, or octal string values.
4223 * @param {*} value The value to process.
4224 * @returns {number} Returns the number.
4226 function baseToNumber(value) {
4227 if (typeof value == 'number') {
4230 if (isSymbol(value)) {
4237 * The base implementation of `_.toString` which doesn't convert nullish
4238 * values to empty strings.
4241 * @param {*} value The value to process.
4242 * @returns {string} Returns the string.
4244 function baseToString(value) {
4245 // Exit early for strings to avoid a performance hit in some environments.
4246 if (typeof value == 'string') {
4249 if (isArray(value)) {
4250 // Recursively convert values (susceptible to call stack limits).
4251 return arrayMap(value, baseToString) + '';
4253 if (isSymbol(value)) {
4254 return symbolToString ? symbolToString.call(value) : '';
4256 var result = (value + '');
4257 return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
4261 * The base implementation of `_.uniqBy` without support for iteratee shorthands.
4264 * @param {Array} array The array to inspect.
4265 * @param {Function} [iteratee] The iteratee invoked per element.
4266 * @param {Function} [comparator] The comparator invoked per element.
4267 * @returns {Array} Returns the new duplicate free array.
4269 function baseUniq(array, iteratee, comparator) {
4271 includes = arrayIncludes,
4272 length = array.length,
4279 includes = arrayIncludesWith;
4281 else if (length >= LARGE_ARRAY_SIZE) {
4282 var set = iteratee ? null : createSet(array);
4284 return setToArray(set);
4287 includes = cacheHas;
4288 seen = new SetCache;
4291 seen = iteratee ? [] : result;
4294 while (++index < length) {
4295 var value = array[index],
4296 computed = iteratee ? iteratee(value) : value;
4298 value = (comparator || value !== 0) ? value : 0;
4299 if (isCommon && computed === computed) {
4300 var seenIndex = seen.length;
4301 while (seenIndex--) {
4302 if (seen[seenIndex] === computed) {
4307 seen.push(computed);
4311 else if (!includes(seen, computed, comparator)) {
4312 if (seen !== result) {
4313 seen.push(computed);
4322 * The base implementation of `_.unset`.
4325 * @param {Object} object The object to modify.
4326 * @param {Array|string} path The property path to unset.
4327 * @returns {boolean} Returns `true` if the property is deleted, else `false`.
4329 function baseUnset(object, path) {
4330 path = castPath(path, object);
4331 object = parent(object, path);
4332 return object == null || delete object[toKey(last(path))];
4336 * The base implementation of `_.update`.
4339 * @param {Object} object The object to modify.
4340 * @param {Array|string} path The path of the property to update.
4341 * @param {Function} updater The function to produce the updated value.
4342 * @param {Function} [customizer] The function to customize path creation.
4343 * @returns {Object} Returns `object`.
4345 function baseUpdate(object, path, updater, customizer) {
4346 return baseSet(object, path, updater(baseGet(object, path)), customizer);
4350 * The base implementation of methods like `_.dropWhile` and `_.takeWhile`
4351 * without support for iteratee shorthands.
4354 * @param {Array} array The array to query.
4355 * @param {Function} predicate The function invoked per iteration.
4356 * @param {boolean} [isDrop] Specify dropping elements instead of taking them.
4357 * @param {boolean} [fromRight] Specify iterating from right to left.
4358 * @returns {Array} Returns the slice of `array`.
4360 function baseWhile(array, predicate, isDrop, fromRight) {
4361 var length = array.length,
4362 index = fromRight ? length : -1;
4364 while ((fromRight ? index-- : ++index < length) &&
4365 predicate(array[index], index, array)) {}
4368 ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
4369 : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
4373 * The base implementation of `wrapperValue` which returns the result of
4374 * performing a sequence of actions on the unwrapped `value`, where each
4375 * successive action is supplied the return value of the previous.
4378 * @param {*} value The unwrapped value.
4379 * @param {Array} actions Actions to perform to resolve the unwrapped value.
4380 * @returns {*} Returns the resolved value.
4382 function baseWrapperValue(value, actions) {
4384 if (result instanceof LazyWrapper) {
4385 result = result.value();
4387 return arrayReduce(actions, function(result, action) {
4388 return action.func.apply(action.thisArg, arrayPush([result], action.args));
4393 * The base implementation of methods like `_.xor`, without support for
4394 * iteratee shorthands, that accepts an array of arrays to inspect.
4397 * @param {Array} arrays The arrays to inspect.
4398 * @param {Function} [iteratee] The iteratee invoked per element.
4399 * @param {Function} [comparator] The comparator invoked per element.
4400 * @returns {Array} Returns the new array of values.
4402 function baseXor(arrays, iteratee, comparator) {
4403 var length = arrays.length;
4405 return length ? baseUniq(arrays[0]) : [];
4408 result = Array(length);
4410 while (++index < length) {
4411 var array = arrays[index],
4414 while (++othIndex < length) {
4415 if (othIndex != index) {
4416 result[index] = baseDifference(result[index] || array, arrays[othIndex], iteratee, comparator);
4420 return baseUniq(baseFlatten(result, 1), iteratee, comparator);
4424 * This base implementation of `_.zipObject` which assigns values using `assignFunc`.
4427 * @param {Array} props The property identifiers.
4428 * @param {Array} values The property values.
4429 * @param {Function} assignFunc The function to assign values.
4430 * @returns {Object} Returns the new object.
4432 function baseZipObject(props, values, assignFunc) {
4434 length = props.length,
4435 valsLength = values.length,
4438 while (++index < length) {
4439 var value = index < valsLength ? values[index] : undefined;
4440 assignFunc(result, props[index], value);
4446 * Casts `value` to an empty array if it's not an array like object.
4449 * @param {*} value The value to inspect.
4450 * @returns {Array|Object} Returns the cast array-like object.
4452 function castArrayLikeObject(value) {
4453 return isArrayLikeObject(value) ? value : [];
4457 * Casts `value` to `identity` if it's not a function.
4460 * @param {*} value The value to inspect.
4461 * @returns {Function} Returns cast function.
4463 function castFunction(value) {
4464 return typeof value == 'function' ? value : identity;
4468 * Casts `value` to a path array if it's not one.
4471 * @param {*} value The value to inspect.
4472 * @param {Object} [object] The object to query keys on.
4473 * @returns {Array} Returns the cast property path array.
4475 function castPath(value, object) {
4476 if (isArray(value)) {
4479 return isKey(value, object) ? [value] : stringToPath(toString(value));
4483 * A `baseRest` alias which can be replaced with `identity` by module
4484 * replacement plugins.
4488 * @param {Function} func The function to apply a rest parameter to.
4489 * @returns {Function} Returns the new function.
4491 var castRest = baseRest;
4494 * Casts `array` to a slice if it's needed.
4497 * @param {Array} array The array to inspect.
4498 * @param {number} start The start position.
4499 * @param {number} [end=array.length] The end position.
4500 * @returns {Array} Returns the cast slice.
4502 function castSlice(array, start, end) {
4503 var length = array.length;
4504 end = end === undefined ? length : end;
4505 return (!start && end >= length) ? array : baseSlice(array, start, end);
4509 * A simple wrapper around the global [`clearTimeout`](https://mdn.io/clearTimeout).
4512 * @param {number|Object} id The timer id or timeout object of the timer to clear.
4514 var clearTimeout = ctxClearTimeout || function(id) {
4515 return root.clearTimeout(id);
4519 * Creates a clone of `buffer`.
4522 * @param {Buffer} buffer The buffer to clone.
4523 * @param {boolean} [isDeep] Specify a deep clone.
4524 * @returns {Buffer} Returns the cloned buffer.
4526 function cloneBuffer(buffer, isDeep) {
4528 return buffer.slice();
4530 var length = buffer.length,
4531 result = allocUnsafe ? allocUnsafe(length) : new buffer.constructor(length);
4533 buffer.copy(result);
4538 * Creates a clone of `arrayBuffer`.
4541 * @param {ArrayBuffer} arrayBuffer The array buffer to clone.
4542 * @returns {ArrayBuffer} Returns the cloned array buffer.
4544 function cloneArrayBuffer(arrayBuffer) {
4545 var result = new arrayBuffer.constructor(arrayBuffer.byteLength);
4546 new Uint8Array(result).set(new Uint8Array(arrayBuffer));
4551 * Creates a clone of `dataView`.
4554 * @param {Object} dataView The data view to clone.
4555 * @param {boolean} [isDeep] Specify a deep clone.
4556 * @returns {Object} Returns the cloned data view.
4558 function cloneDataView(dataView, isDeep) {
4559 var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;
4560 return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);
4564 * Creates a clone of `regexp`.
4567 * @param {Object} regexp The regexp to clone.
4568 * @returns {Object} Returns the cloned regexp.
4570 function cloneRegExp(regexp) {
4571 var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));
4572 result.lastIndex = regexp.lastIndex;
4577 * Creates a clone of the `symbol` object.
4580 * @param {Object} symbol The symbol object to clone.
4581 * @returns {Object} Returns the cloned symbol object.
4583 function cloneSymbol(symbol) {
4584 return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};
4588 * Creates a clone of `typedArray`.
4591 * @param {Object} typedArray The typed array to clone.
4592 * @param {boolean} [isDeep] Specify a deep clone.
4593 * @returns {Object} Returns the cloned typed array.
4595 function cloneTypedArray(typedArray, isDeep) {
4596 var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;
4597 return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);
4601 * Compares values to sort them in ascending order.
4604 * @param {*} value The value to compare.
4605 * @param {*} other The other value to compare.
4606 * @returns {number} Returns the sort order indicator for `value`.
4608 function compareAscending(value, other) {
4609 if (value !== other) {
4610 var valIsDefined = value !== undefined,
4611 valIsNull = value === null,
4612 valIsReflexive = value === value,
4613 valIsSymbol = isSymbol(value);
4615 var othIsDefined = other !== undefined,
4616 othIsNull = other === null,
4617 othIsReflexive = other === other,
4618 othIsSymbol = isSymbol(other);
4620 if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||
4621 (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||
4622 (valIsNull && othIsDefined && othIsReflexive) ||
4623 (!valIsDefined && othIsReflexive) ||
4627 if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||
4628 (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||
4629 (othIsNull && valIsDefined && valIsReflexive) ||
4630 (!othIsDefined && valIsReflexive) ||
4639 * Used by `_.orderBy` to compare multiple properties of a value to another
4640 * and stable sort them.
4642 * If `orders` is unspecified, all values are sorted in ascending order. Otherwise,
4643 * specify an order of "desc" for descending or "asc" for ascending sort order
4644 * of corresponding values.
4647 * @param {Object} object The object to compare.
4648 * @param {Object} other The other object to compare.
4649 * @param {boolean[]|string[]} orders The order to sort by for each property.
4650 * @returns {number} Returns the sort order indicator for `object`.
4652 function compareMultiple(object, other, orders) {
4654 objCriteria = object.criteria,
4655 othCriteria = other.criteria,
4656 length = objCriteria.length,
4657 ordersLength = orders.length;
4659 while (++index < length) {
4660 var result = compareAscending(objCriteria[index], othCriteria[index]);
4662 if (index >= ordersLength) {
4665 var order = orders[index];
4666 return result * (order == 'desc' ? -1 : 1);
4669 // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications
4670 // that causes it, under certain circumstances, to provide the same value for
4671 // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247
4672 // for more details.
4674 // This also ensures a stable sort in V8 and other engines.
4675 // See https://bugs.chromium.org/p/v8/issues/detail?id=90 for more details.
4676 return object.index - other.index;
4680 * Creates an array that is the composition of partially applied arguments,
4681 * placeholders, and provided arguments into a single array of arguments.
4684 * @param {Array} args The provided arguments.
4685 * @param {Array} partials The arguments to prepend to those provided.
4686 * @param {Array} holders The `partials` placeholder indexes.
4687 * @params {boolean} [isCurried] Specify composing for a curried function.
4688 * @returns {Array} Returns the new array of composed arguments.
4690 function composeArgs(args, partials, holders, isCurried) {
4692 argsLength = args.length,
4693 holdersLength = holders.length,
4695 leftLength = partials.length,
4696 rangeLength = nativeMax(argsLength - holdersLength, 0),
4697 result = Array(leftLength + rangeLength),
4698 isUncurried = !isCurried;
4700 while (++leftIndex < leftLength) {
4701 result[leftIndex] = partials[leftIndex];
4703 while (++argsIndex < holdersLength) {
4704 if (isUncurried || argsIndex < argsLength) {
4705 result[holders[argsIndex]] = args[argsIndex];
4708 while (rangeLength--) {
4709 result[leftIndex++] = args[argsIndex++];
4715 * This function is like `composeArgs` except that the arguments composition
4716 * is tailored for `_.partialRight`.
4719 * @param {Array} args The provided arguments.
4720 * @param {Array} partials The arguments to append to those provided.
4721 * @param {Array} holders The `partials` placeholder indexes.
4722 * @params {boolean} [isCurried] Specify composing for a curried function.
4723 * @returns {Array} Returns the new array of composed arguments.
4725 function composeArgsRight(args, partials, holders, isCurried) {
4727 argsLength = args.length,
4729 holdersLength = holders.length,
4731 rightLength = partials.length,
4732 rangeLength = nativeMax(argsLength - holdersLength, 0),
4733 result = Array(rangeLength + rightLength),
4734 isUncurried = !isCurried;
4736 while (++argsIndex < rangeLength) {
4737 result[argsIndex] = args[argsIndex];
4739 var offset = argsIndex;
4740 while (++rightIndex < rightLength) {
4741 result[offset + rightIndex] = partials[rightIndex];
4743 while (++holdersIndex < holdersLength) {
4744 if (isUncurried || argsIndex < argsLength) {
4745 result[offset + holders[holdersIndex]] = args[argsIndex++];
4752 * Copies the values of `source` to `array`.
4755 * @param {Array} source The array to copy values from.
4756 * @param {Array} [array=[]] The array to copy values to.
4757 * @returns {Array} Returns `array`.
4759 function copyArray(source, array) {
4761 length = source.length;
4763 array || (array = Array(length));
4764 while (++index < length) {
4765 array[index] = source[index];
4771 * Copies properties of `source` to `object`.
4774 * @param {Object} source The object to copy properties from.
4775 * @param {Array} props The property identifiers to copy.
4776 * @param {Object} [object={}] The object to copy properties to.
4777 * @param {Function} [customizer] The function to customize copied values.
4778 * @returns {Object} Returns `object`.
4780 function copyObject(source, props, object, customizer) {
4781 var isNew = !object;
4782 object || (object = {});
4785 length = props.length;
4787 while (++index < length) {
4788 var key = props[index];
4790 var newValue = customizer
4791 ? customizer(object[key], source[key], key, object, source)
4794 if (newValue === undefined) {
4795 newValue = source[key];
4798 baseAssignValue(object, key, newValue);
4800 assignValue(object, key, newValue);
4807 * Copies own symbols of `source` to `object`.
4810 * @param {Object} source The object to copy symbols from.
4811 * @param {Object} [object={}] The object to copy symbols to.
4812 * @returns {Object} Returns `object`.
4814 function copySymbols(source, object) {
4815 return copyObject(source, getSymbols(source), object);
4819 * Copies own and inherited symbols of `source` to `object`.
4822 * @param {Object} source The object to copy symbols from.
4823 * @param {Object} [object={}] The object to copy symbols to.
4824 * @returns {Object} Returns `object`.
4826 function copySymbolsIn(source, object) {
4827 return copyObject(source, getSymbolsIn(source), object);
4831 * Creates a function like `_.groupBy`.
4834 * @param {Function} setter The function to set accumulator values.
4835 * @param {Function} [initializer] The accumulator object initializer.
4836 * @returns {Function} Returns the new aggregator function.
4838 function createAggregator(setter, initializer) {
4839 return function(collection, iteratee) {
4840 var func = isArray(collection) ? arrayAggregator : baseAggregator,
4841 accumulator = initializer ? initializer() : {};
4843 return func(collection, setter, getIteratee(iteratee, 2), accumulator);
4848 * Creates a function like `_.assign`.
4851 * @param {Function} assigner The function to assign values.
4852 * @returns {Function} Returns the new assigner function.
4854 function createAssigner(assigner) {
4855 return baseRest(function(object, sources) {
4857 length = sources.length,
4858 customizer = length > 1 ? sources[length - 1] : undefined,
4859 guard = length > 2 ? sources[2] : undefined;
4861 customizer = (assigner.length > 3 && typeof customizer == 'function')
4862 ? (length--, customizer)
4865 if (guard && isIterateeCall(sources[0], sources[1], guard)) {
4866 customizer = length < 3 ? undefined : customizer;
4869 object = Object(object);
4870 while (++index < length) {
4871 var source = sources[index];
4873 assigner(object, source, index, customizer);
4881 * Creates a `baseEach` or `baseEachRight` function.
4884 * @param {Function} eachFunc The function to iterate over a collection.
4885 * @param {boolean} [fromRight] Specify iterating from right to left.
4886 * @returns {Function} Returns the new base function.
4888 function createBaseEach(eachFunc, fromRight) {
4889 return function(collection, iteratee) {
4890 if (collection == null) {
4893 if (!isArrayLike(collection)) {
4894 return eachFunc(collection, iteratee);
4896 var length = collection.length,
4897 index = fromRight ? length : -1,
4898 iterable = Object(collection);
4900 while ((fromRight ? index-- : ++index < length)) {
4901 if (iteratee(iterable[index], index, iterable) === false) {
4910 * Creates a base function for methods like `_.forIn` and `_.forOwn`.
4913 * @param {boolean} [fromRight] Specify iterating from right to left.
4914 * @returns {Function} Returns the new base function.
4916 function createBaseFor(fromRight) {
4917 return function(object, iteratee, keysFunc) {
4919 iterable = Object(object),
4920 props = keysFunc(object),
4921 length = props.length;
4924 var key = props[fromRight ? length : ++index];
4925 if (iteratee(iterable[key], key, iterable) === false) {
4934 * Creates a function that wraps `func` to invoke it with the optional `this`
4935 * binding of `thisArg`.
4938 * @param {Function} func The function to wrap.
4939 * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
4940 * @param {*} [thisArg] The `this` binding of `func`.
4941 * @returns {Function} Returns the new wrapped function.
4943 function createBind(func, bitmask, thisArg) {
4944 var isBind = bitmask & WRAP_BIND_FLAG,
4945 Ctor = createCtor(func);
4947 function wrapper() {
4948 var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
4949 return fn.apply(isBind ? thisArg : this, arguments);
4955 * Creates a function like `_.lowerFirst`.
4958 * @param {string} methodName The name of the `String` case method to use.
4959 * @returns {Function} Returns the new case function.
4961 function createCaseFirst(methodName) {
4962 return function(string) {
4963 string = toString(string);
4965 var strSymbols = hasUnicode(string)
4966 ? stringToArray(string)
4969 var chr = strSymbols
4973 var trailing = strSymbols
4974 ? castSlice(strSymbols, 1).join('')
4977 return chr[methodName]() + trailing;
4982 * Creates a function like `_.camelCase`.
4985 * @param {Function} callback The function to combine each word.
4986 * @returns {Function} Returns the new compounder function.
4988 function createCompounder(callback) {
4989 return function(string) {
4990 return arrayReduce(words(deburr(string).replace(reApos, '')), callback, '');
4995 * Creates a function that produces an instance of `Ctor` regardless of
4996 * whether it was invoked as part of a `new` expression or by `call` or `apply`.
4999 * @param {Function} Ctor The constructor to wrap.
5000 * @returns {Function} Returns the new wrapped function.
5002 function createCtor(Ctor) {
5004 // Use a `switch` statement to work with class constructors. See
5005 // http://ecma-international.org/ecma-262/7.0/#sec-ecmascript-function-objects-call-thisargument-argumentslist
5006 // for more details.
5007 var args = arguments;
5008 switch (args.length) {
5009 case 0: return new Ctor;
5010 case 1: return new Ctor(args[0]);
5011 case 2: return new Ctor(args[0], args[1]);
5012 case 3: return new Ctor(args[0], args[1], args[2]);
5013 case 4: return new Ctor(args[0], args[1], args[2], args[3]);
5014 case 5: return new Ctor(args[0], args[1], args[2], args[3], args[4]);
5015 case 6: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5]);
5016 case 7: return new Ctor(args[0], args[1], args[2], args[3], args[4], args[5], args[6]);
5018 var thisBinding = baseCreate(Ctor.prototype),
5019 result = Ctor.apply(thisBinding, args);
5021 // Mimic the constructor's `return` behavior.
5022 // See https://es5.github.io/#x13.2.2 for more details.
5023 return isObject(result) ? result : thisBinding;
5028 * Creates a function that wraps `func` to enable currying.
5031 * @param {Function} func The function to wrap.
5032 * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
5033 * @param {number} arity The arity of `func`.
5034 * @returns {Function} Returns the new wrapped function.
5036 function createCurry(func, bitmask, arity) {
5037 var Ctor = createCtor(func);
5039 function wrapper() {
5040 var length = arguments.length,
5041 args = Array(length),
5043 placeholder = getHolder(wrapper);
5046 args[index] = arguments[index];
5048 var holders = (length < 3 && args[0] !== placeholder && args[length - 1] !== placeholder)
5050 : replaceHolders(args, placeholder);
5052 length -= holders.length;
5053 if (length < arity) {
5054 return createRecurry(
5055 func, bitmask, createHybrid, wrapper.placeholder, undefined,
5056 args, holders, undefined, undefined, arity - length);
5058 var fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
5059 return apply(fn, this, args);
5065 * Creates a `_.find` or `_.findLast` function.
5068 * @param {Function} findIndexFunc The function to find the collection index.
5069 * @returns {Function} Returns the new find function.
5071 function createFind(findIndexFunc) {
5072 return function(collection, predicate, fromIndex) {
5073 var iterable = Object(collection);
5074 if (!isArrayLike(collection)) {
5075 var iteratee = getIteratee(predicate, 3);
5076 collection = keys(collection);
5077 predicate = function(key) { return iteratee(iterable[key], key, iterable); };
5079 var index = findIndexFunc(collection, predicate, fromIndex);
5080 return index > -1 ? iterable[iteratee ? collection[index] : index] : undefined;
5085 * Creates a `_.flow` or `_.flowRight` function.
5088 * @param {boolean} [fromRight] Specify iterating from right to left.
5089 * @returns {Function} Returns the new flow function.
5091 function createFlow(fromRight) {
5092 return flatRest(function(funcs) {
5093 var length = funcs.length,
5095 prereq = LodashWrapper.prototype.thru;
5101 var func = funcs[index];
5102 if (typeof func != 'function') {
5103 throw new TypeError(FUNC_ERROR_TEXT);
5105 if (prereq && !wrapper && getFuncName(func) == 'wrapper') {
5106 var wrapper = new LodashWrapper([], true);
5109 index = wrapper ? index : length;
5110 while (++index < length) {
5111 func = funcs[index];
5113 var funcName = getFuncName(func),
5114 data = funcName == 'wrapper' ? getData(func) : undefined;
5116 if (data && isLaziable(data[0]) &&
5117 data[1] == (WRAP_ARY_FLAG | WRAP_CURRY_FLAG | WRAP_PARTIAL_FLAG | WRAP_REARG_FLAG) &&
5118 !data[4].length && data[9] == 1
5120 wrapper = wrapper[getFuncName(data[0])].apply(wrapper, data[3]);
5122 wrapper = (func.length == 1 && isLaziable(func))
5123 ? wrapper[funcName]()
5124 : wrapper.thru(func);
5128 var args = arguments,
5131 if (wrapper && args.length == 1 && isArray(value)) {
5132 return wrapper.plant(value).value();
5135 result = length ? funcs[index].apply(this, args) : value;
5137 while (++index < length) {
5138 result = funcs[index].call(this, result);
5146 * Creates a function that wraps `func` to invoke it with optional `this`
5147 * binding of `thisArg`, partial application, and currying.
5150 * @param {Function|string} func The function or method name to wrap.
5151 * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
5152 * @param {*} [thisArg] The `this` binding of `func`.
5153 * @param {Array} [partials] The arguments to prepend to those provided to
5155 * @param {Array} [holders] The `partials` placeholder indexes.
5156 * @param {Array} [partialsRight] The arguments to append to those provided
5157 * to the new function.
5158 * @param {Array} [holdersRight] The `partialsRight` placeholder indexes.
5159 * @param {Array} [argPos] The argument positions of the new function.
5160 * @param {number} [ary] The arity cap of `func`.
5161 * @param {number} [arity] The arity of `func`.
5162 * @returns {Function} Returns the new wrapped function.
5164 function createHybrid(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) {
5165 var isAry = bitmask & WRAP_ARY_FLAG,
5166 isBind = bitmask & WRAP_BIND_FLAG,
5167 isBindKey = bitmask & WRAP_BIND_KEY_FLAG,
5168 isCurried = bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG),
5169 isFlip = bitmask & WRAP_FLIP_FLAG,
5170 Ctor = isBindKey ? undefined : createCtor(func);
5172 function wrapper() {
5173 var length = arguments.length,
5174 args = Array(length),
5178 args[index] = arguments[index];
5181 var placeholder = getHolder(wrapper),
5182 holdersCount = countHolders(args, placeholder);
5185 args = composeArgs(args, partials, holders, isCurried);
5187 if (partialsRight) {
5188 args = composeArgsRight(args, partialsRight, holdersRight, isCurried);
5190 length -= holdersCount;
5191 if (isCurried && length < arity) {
5192 var newHolders = replaceHolders(args, placeholder);
5193 return createRecurry(
5194 func, bitmask, createHybrid, wrapper.placeholder, thisArg,
5195 args, newHolders, argPos, ary, arity - length
5198 var thisBinding = isBind ? thisArg : this,
5199 fn = isBindKey ? thisBinding[func] : func;
5201 length = args.length;
5203 args = reorder(args, argPos);
5204 } else if (isFlip && length > 1) {
5207 if (isAry && ary < length) {
5210 if (this && this !== root && this instanceof wrapper) {
5211 fn = Ctor || createCtor(fn);
5213 return fn.apply(thisBinding, args);
5219 * Creates a function like `_.invertBy`.
5222 * @param {Function} setter The function to set accumulator values.
5223 * @param {Function} toIteratee The function to resolve iteratees.
5224 * @returns {Function} Returns the new inverter function.
5226 function createInverter(setter, toIteratee) {
5227 return function(object, iteratee) {
5228 return baseInverter(object, setter, toIteratee(iteratee), {});
5233 * Creates a function that performs a mathematical operation on two values.
5236 * @param {Function} operator The function to perform the operation.
5237 * @param {number} [defaultValue] The value used for `undefined` arguments.
5238 * @returns {Function} Returns the new mathematical operation function.
5240 function createMathOperation(operator, defaultValue) {
5241 return function(value, other) {
5243 if (value === undefined && other === undefined) {
5244 return defaultValue;
5246 if (value !== undefined) {
5249 if (other !== undefined) {
5250 if (result === undefined) {
5253 if (typeof value == 'string' || typeof other == 'string') {
5254 value = baseToString(value);
5255 other = baseToString(other);
5257 value = baseToNumber(value);
5258 other = baseToNumber(other);
5260 result = operator(value, other);
5267 * Creates a function like `_.over`.
5270 * @param {Function} arrayFunc The function to iterate over iteratees.
5271 * @returns {Function} Returns the new over function.
5273 function createOver(arrayFunc) {
5274 return flatRest(function(iteratees) {
5275 iteratees = arrayMap(iteratees, baseUnary(getIteratee()));
5276 return baseRest(function(args) {
5278 return arrayFunc(iteratees, function(iteratee) {
5279 return apply(iteratee, thisArg, args);
5286 * Creates the padding for `string` based on `length`. The `chars` string
5287 * is truncated if the number of characters exceeds `length`.
5290 * @param {number} length The padding length.
5291 * @param {string} [chars=' '] The string used as padding.
5292 * @returns {string} Returns the padding for `string`.
5294 function createPadding(length, chars) {
5295 chars = chars === undefined ? ' ' : baseToString(chars);
5297 var charsLength = chars.length;
5298 if (charsLength < 2) {
5299 return charsLength ? baseRepeat(chars, length) : chars;
5301 var result = baseRepeat(chars, nativeCeil(length / stringSize(chars)));
5302 return hasUnicode(chars)
5303 ? castSlice(stringToArray(result), 0, length).join('')
5304 : result.slice(0, length);
5308 * Creates a function that wraps `func` to invoke it with the `this` binding
5309 * of `thisArg` and `partials` prepended to the arguments it receives.
5312 * @param {Function} func The function to wrap.
5313 * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
5314 * @param {*} thisArg The `this` binding of `func`.
5315 * @param {Array} partials The arguments to prepend to those provided to
5317 * @returns {Function} Returns the new wrapped function.
5319 function createPartial(func, bitmask, thisArg, partials) {
5320 var isBind = bitmask & WRAP_BIND_FLAG,
5321 Ctor = createCtor(func);
5323 function wrapper() {
5325 argsLength = arguments.length,
5327 leftLength = partials.length,
5328 args = Array(leftLength + argsLength),
5329 fn = (this && this !== root && this instanceof wrapper) ? Ctor : func;
5331 while (++leftIndex < leftLength) {
5332 args[leftIndex] = partials[leftIndex];
5334 while (argsLength--) {
5335 args[leftIndex++] = arguments[++argsIndex];
5337 return apply(fn, isBind ? thisArg : this, args);
5343 * Creates a `_.range` or `_.rangeRight` function.
5346 * @param {boolean} [fromRight] Specify iterating from right to left.
5347 * @returns {Function} Returns the new range function.
5349 function createRange(fromRight) {
5350 return function(start, end, step) {
5351 if (step && typeof step != 'number' && isIterateeCall(start, end, step)) {
5352 end = step = undefined;
5354 // Ensure the sign of `-0` is preserved.
5355 start = toFinite(start);
5356 if (end === undefined) {
5360 end = toFinite(end);
5362 step = step === undefined ? (start < end ? 1 : -1) : toFinite(step);
5363 return baseRange(start, end, step, fromRight);
5368 * Creates a function that performs a relational operation on two values.
5371 * @param {Function} operator The function to perform the operation.
5372 * @returns {Function} Returns the new relational operation function.
5374 function createRelationalOperation(operator) {
5375 return function(value, other) {
5376 if (!(typeof value == 'string' && typeof other == 'string')) {
5377 value = toNumber(value);
5378 other = toNumber(other);
5380 return operator(value, other);
5385 * Creates a function that wraps `func` to continue currying.
5388 * @param {Function} func The function to wrap.
5389 * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
5390 * @param {Function} wrapFunc The function to create the `func` wrapper.
5391 * @param {*} placeholder The placeholder value.
5392 * @param {*} [thisArg] The `this` binding of `func`.
5393 * @param {Array} [partials] The arguments to prepend to those provided to
5395 * @param {Array} [holders] The `partials` placeholder indexes.
5396 * @param {Array} [argPos] The argument positions of the new function.
5397 * @param {number} [ary] The arity cap of `func`.
5398 * @param {number} [arity] The arity of `func`.
5399 * @returns {Function} Returns the new wrapped function.
5401 function createRecurry(func, bitmask, wrapFunc, placeholder, thisArg, partials, holders, argPos, ary, arity) {
5402 var isCurry = bitmask & WRAP_CURRY_FLAG,
5403 newHolders = isCurry ? holders : undefined,
5404 newHoldersRight = isCurry ? undefined : holders,
5405 newPartials = isCurry ? partials : undefined,
5406 newPartialsRight = isCurry ? undefined : partials;
5408 bitmask |= (isCurry ? WRAP_PARTIAL_FLAG : WRAP_PARTIAL_RIGHT_FLAG);
5409 bitmask &= ~(isCurry ? WRAP_PARTIAL_RIGHT_FLAG : WRAP_PARTIAL_FLAG);
5411 if (!(bitmask & WRAP_CURRY_BOUND_FLAG)) {
5412 bitmask &= ~(WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG);
5415 func, bitmask, thisArg, newPartials, newHolders, newPartialsRight,
5416 newHoldersRight, argPos, ary, arity
5419 var result = wrapFunc.apply(undefined, newData);
5420 if (isLaziable(func)) {
5421 setData(result, newData);
5423 result.placeholder = placeholder;
5424 return setWrapToString(result, func, bitmask);
5428 * Creates a function like `_.round`.
5431 * @param {string} methodName The name of the `Math` method to use when rounding.
5432 * @returns {Function} Returns the new round function.
5434 function createRound(methodName) {
5435 var func = Math[methodName];
5436 return function(number, precision) {
5437 number = toNumber(number);
5438 precision = precision == null ? 0 : nativeMin(toInteger(precision), 292);
5439 if (precision && nativeIsFinite(number)) {
5440 // Shift with exponential notation to avoid floating-point issues.
5441 // See [MDN](https://mdn.io/round#Examples) for more details.
5442 var pair = (toString(number) + 'e').split('e'),
5443 value = func(pair[0] + 'e' + (+pair[1] + precision));
5445 pair = (toString(value) + 'e').split('e');
5446 return +(pair[0] + 'e' + (+pair[1] - precision));
5448 return func(number);
5453 * Creates a set object of `values`.
5456 * @param {Array} values The values to add to the set.
5457 * @returns {Object} Returns the new set.
5459 var createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {
5460 return new Set(values);
5464 * Creates a `_.toPairs` or `_.toPairsIn` function.
5467 * @param {Function} keysFunc The function to get the keys of a given object.
5468 * @returns {Function} Returns the new pairs function.
5470 function createToPairs(keysFunc) {
5471 return function(object) {
5472 var tag = getTag(object);
5473 if (tag == mapTag) {
5474 return mapToArray(object);
5476 if (tag == setTag) {
5477 return setToPairs(object);
5479 return baseToPairs(object, keysFunc(object));
5484 * Creates a function that either curries or invokes `func` with optional
5485 * `this` binding and partially applied arguments.
5488 * @param {Function|string} func The function or method name to wrap.
5489 * @param {number} bitmask The bitmask flags.
5492 * 4 - `_.curry` or `_.curryRight` of a bound function
5494 * 16 - `_.curryRight`
5496 * 64 - `_.partialRight`
5500 * @param {*} [thisArg] The `this` binding of `func`.
5501 * @param {Array} [partials] The arguments to be partially applied.
5502 * @param {Array} [holders] The `partials` placeholder indexes.
5503 * @param {Array} [argPos] The argument positions of the new function.
5504 * @param {number} [ary] The arity cap of `func`.
5505 * @param {number} [arity] The arity of `func`.
5506 * @returns {Function} Returns the new wrapped function.
5508 function createWrap(func, bitmask, thisArg, partials, holders, argPos, ary, arity) {
5509 var isBindKey = bitmask & WRAP_BIND_KEY_FLAG;
5510 if (!isBindKey && typeof func != 'function') {
5511 throw new TypeError(FUNC_ERROR_TEXT);
5513 var length = partials ? partials.length : 0;
5515 bitmask &= ~(WRAP_PARTIAL_FLAG | WRAP_PARTIAL_RIGHT_FLAG);
5516 partials = holders = undefined;
5518 ary = ary === undefined ? ary : nativeMax(toInteger(ary), 0);
5519 arity = arity === undefined ? arity : toInteger(arity);
5520 length -= holders ? holders.length : 0;
5522 if (bitmask & WRAP_PARTIAL_RIGHT_FLAG) {
5523 var partialsRight = partials,
5524 holdersRight = holders;
5526 partials = holders = undefined;
5528 var data = isBindKey ? undefined : getData(func);
5531 func, bitmask, thisArg, partials, holders, partialsRight, holdersRight,
5536 mergeData(newData, data);
5539 bitmask = newData[1];
5540 thisArg = newData[2];
5541 partials = newData[3];
5542 holders = newData[4];
5543 arity = newData[9] = newData[9] === undefined
5544 ? (isBindKey ? 0 : func.length)
5545 : nativeMax(newData[9] - length, 0);
5547 if (!arity && bitmask & (WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG)) {
5548 bitmask &= ~(WRAP_CURRY_FLAG | WRAP_CURRY_RIGHT_FLAG);
5550 if (!bitmask || bitmask == WRAP_BIND_FLAG) {
5551 var result = createBind(func, bitmask, thisArg);
5552 } else if (bitmask == WRAP_CURRY_FLAG || bitmask == WRAP_CURRY_RIGHT_FLAG) {
5553 result = createCurry(func, bitmask, arity);
5554 } else if ((bitmask == WRAP_PARTIAL_FLAG || bitmask == (WRAP_BIND_FLAG | WRAP_PARTIAL_FLAG)) && !holders.length) {
5555 result = createPartial(func, bitmask, thisArg, partials);
5557 result = createHybrid.apply(undefined, newData);
5559 var setter = data ? baseSetData : setData;
5560 return setWrapToString(setter(result, newData), func, bitmask);
5564 * Used by `_.defaults` to customize its `_.assignIn` use to assign properties
5565 * of source objects to the destination object for all destination properties
5566 * that resolve to `undefined`.
5569 * @param {*} objValue The destination value.
5570 * @param {*} srcValue The source value.
5571 * @param {string} key The key of the property to assign.
5572 * @param {Object} object The parent object of `objValue`.
5573 * @returns {*} Returns the value to assign.
5575 function customDefaultsAssignIn(objValue, srcValue, key, object) {
5576 if (objValue === undefined ||
5577 (eq(objValue, objectProto[key]) && !hasOwnProperty.call(object, key))) {
5584 * Used by `_.defaultsDeep` to customize its `_.merge` use to merge source
5585 * objects into destination objects that are passed thru.
5588 * @param {*} objValue The destination value.
5589 * @param {*} srcValue The source value.
5590 * @param {string} key The key of the property to merge.
5591 * @param {Object} object The parent object of `objValue`.
5592 * @param {Object} source The parent object of `srcValue`.
5593 * @param {Object} [stack] Tracks traversed source values and their merged
5595 * @returns {*} Returns the value to assign.
5597 function customDefaultsMerge(objValue, srcValue, key, object, source, stack) {
5598 if (isObject(objValue) && isObject(srcValue)) {
5599 // Recursively merge objects and arrays (susceptible to call stack limits).
5600 stack.set(srcValue, objValue);
5601 baseMerge(objValue, srcValue, undefined, customDefaultsMerge, stack);
5602 stack['delete'](srcValue);
5608 * Used by `_.omit` to customize its `_.cloneDeep` use to only clone plain
5612 * @param {*} value The value to inspect.
5613 * @param {string} key The key of the property to inspect.
5614 * @returns {*} Returns the uncloned value or `undefined` to defer cloning to `_.cloneDeep`.
5616 function customOmitClone(value) {
5617 return isPlainObject(value) ? undefined : value;
5621 * A specialized version of `baseIsEqualDeep` for arrays with support for
5622 * partial deep comparisons.
5625 * @param {Array} array The array to compare.
5626 * @param {Array} other The other array to compare.
5627 * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
5628 * @param {Function} customizer The function to customize comparisons.
5629 * @param {Function} equalFunc The function to determine equivalents of values.
5630 * @param {Object} stack Tracks traversed `array` and `other` objects.
5631 * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
5633 function equalArrays(array, other, bitmask, customizer, equalFunc, stack) {
5634 var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
5635 arrLength = array.length,
5636 othLength = other.length;
5638 if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
5641 // Check that cyclic values are equal.
5642 var arrStacked = stack.get(array);
5643 var othStacked = stack.get(other);
5644 if (arrStacked && othStacked) {
5645 return arrStacked == other && othStacked == array;
5649 seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;
5651 stack.set(array, other);
5652 stack.set(other, array);
5654 // Ignore non-index properties.
5655 while (++index < arrLength) {
5656 var arrValue = array[index],
5657 othValue = other[index];
5660 var compared = isPartial
5661 ? customizer(othValue, arrValue, index, other, array, stack)
5662 : customizer(arrValue, othValue, index, array, other, stack);
5664 if (compared !== undefined) {
5671 // Recursively compare arrays (susceptible to call stack limits).
5673 if (!arraySome(other, function(othValue, othIndex) {
5674 if (!cacheHas(seen, othIndex) &&
5675 (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {
5676 return seen.push(othIndex);
5683 arrValue === othValue ||
5684 equalFunc(arrValue, othValue, bitmask, customizer, stack)
5690 stack['delete'](array);
5691 stack['delete'](other);
5696 * A specialized version of `baseIsEqualDeep` for comparing objects of
5697 * the same `toStringTag`.
5699 * **Note:** This function only supports comparing values with tags of
5700 * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
5703 * @param {Object} object The object to compare.
5704 * @param {Object} other The other object to compare.
5705 * @param {string} tag The `toStringTag` of the objects to compare.
5706 * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
5707 * @param {Function} customizer The function to customize comparisons.
5708 * @param {Function} equalFunc The function to determine equivalents of values.
5709 * @param {Object} stack Tracks traversed `object` and `other` objects.
5710 * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
5712 function equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {
5715 if ((object.byteLength != other.byteLength) ||
5716 (object.byteOffset != other.byteOffset)) {
5719 object = object.buffer;
5720 other = other.buffer;
5722 case arrayBufferTag:
5723 if ((object.byteLength != other.byteLength) ||
5724 !equalFunc(new Uint8Array(object), new Uint8Array(other))) {
5732 // Coerce booleans to `1` or `0` and dates to milliseconds.
5733 // Invalid dates are coerced to `NaN`.
5734 return eq(+object, +other);
5737 return object.name == other.name && object.message == other.message;
5741 // Coerce regexes to strings and treat strings, primitives and objects,
5742 // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring
5743 // for more details.
5744 return object == (other + '');
5747 var convert = mapToArray;
5750 var isPartial = bitmask & COMPARE_PARTIAL_FLAG;
5751 convert || (convert = setToArray);
5753 if (object.size != other.size && !isPartial) {
5756 // Assume cyclic values are equal.
5757 var stacked = stack.get(object);
5759 return stacked == other;
5761 bitmask |= COMPARE_UNORDERED_FLAG;
5763 // Recursively compare objects (susceptible to call stack limits).
5764 stack.set(object, other);
5765 var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);
5766 stack['delete'](object);
5770 if (symbolValueOf) {
5771 return symbolValueOf.call(object) == symbolValueOf.call(other);
5778 * A specialized version of `baseIsEqualDeep` for objects with support for
5779 * partial deep comparisons.
5782 * @param {Object} object The object to compare.
5783 * @param {Object} other The other object to compare.
5784 * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.
5785 * @param {Function} customizer The function to customize comparisons.
5786 * @param {Function} equalFunc The function to determine equivalents of values.
5787 * @param {Object} stack Tracks traversed `object` and `other` objects.
5788 * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.
5790 function equalObjects(object, other, bitmask, customizer, equalFunc, stack) {
5791 var isPartial = bitmask & COMPARE_PARTIAL_FLAG,
5792 objProps = getAllKeys(object),
5793 objLength = objProps.length,
5794 othProps = getAllKeys(other),
5795 othLength = othProps.length;
5797 if (objLength != othLength && !isPartial) {
5800 var index = objLength;
5802 var key = objProps[index];
5803 if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {
5807 // Check that cyclic values are equal.
5808 var objStacked = stack.get(object);
5809 var othStacked = stack.get(other);
5810 if (objStacked && othStacked) {
5811 return objStacked == other && othStacked == object;
5814 stack.set(object, other);
5815 stack.set(other, object);
5817 var skipCtor = isPartial;
5818 while (++index < objLength) {
5819 key = objProps[index];
5820 var objValue = object[key],
5821 othValue = other[key];
5824 var compared = isPartial
5825 ? customizer(othValue, objValue, key, other, object, stack)
5826 : customizer(objValue, othValue, key, object, other, stack);
5828 // Recursively compare objects (susceptible to call stack limits).
5829 if (!(compared === undefined
5830 ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))
5836 skipCtor || (skipCtor = key == 'constructor');
5838 if (result && !skipCtor) {
5839 var objCtor = object.constructor,
5840 othCtor = other.constructor;
5842 // Non `Object` object instances with different constructors are not equal.
5843 if (objCtor != othCtor &&
5844 ('constructor' in object && 'constructor' in other) &&
5845 !(typeof objCtor == 'function' && objCtor instanceof objCtor &&
5846 typeof othCtor == 'function' && othCtor instanceof othCtor)) {
5850 stack['delete'](object);
5851 stack['delete'](other);
5856 * A specialized version of `baseRest` which flattens the rest array.
5859 * @param {Function} func The function to apply a rest parameter to.
5860 * @returns {Function} Returns the new function.
5862 function flatRest(func) {
5863 return setToString(overRest(func, undefined, flatten), func + '');
5867 * Creates an array of own enumerable property names and symbols of `object`.
5870 * @param {Object} object The object to query.
5871 * @returns {Array} Returns the array of property names and symbols.
5873 function getAllKeys(object) {
5874 return baseGetAllKeys(object, keys, getSymbols);
5878 * Creates an array of own and inherited enumerable property names and
5879 * symbols of `object`.
5882 * @param {Object} object The object to query.
5883 * @returns {Array} Returns the array of property names and symbols.
5885 function getAllKeysIn(object) {
5886 return baseGetAllKeys(object, keysIn, getSymbolsIn);
5890 * Gets metadata for `func`.
5893 * @param {Function} func The function to query.
5894 * @returns {*} Returns the metadata for `func`.
5896 var getData = !metaMap ? noop : function(func) {
5897 return metaMap.get(func);
5901 * Gets the name of `func`.
5904 * @param {Function} func The function to query.
5905 * @returns {string} Returns the function name.
5907 function getFuncName(func) {
5908 var result = (func.name + ''),
5909 array = realNames[result],
5910 length = hasOwnProperty.call(realNames, result) ? array.length : 0;
5913 var data = array[length],
5914 otherFunc = data.func;
5915 if (otherFunc == null || otherFunc == func) {
5923 * Gets the argument placeholder value for `func`.
5926 * @param {Function} func The function to inspect.
5927 * @returns {*} Returns the placeholder value.
5929 function getHolder(func) {
5930 var object = hasOwnProperty.call(lodash, 'placeholder') ? lodash : func;
5931 return object.placeholder;
5935 * Gets the appropriate "iteratee" function. If `_.iteratee` is customized,
5936 * this function returns the custom method, otherwise it returns `baseIteratee`.
5937 * If arguments are provided, the chosen function is invoked with them and
5938 * its result is returned.
5941 * @param {*} [value] The value to convert to an iteratee.
5942 * @param {number} [arity] The arity of the created iteratee.
5943 * @returns {Function} Returns the chosen function or its result.
5945 function getIteratee() {
5946 var result = lodash.iteratee || iteratee;
5947 result = result === iteratee ? baseIteratee : result;
5948 return arguments.length ? result(arguments[0], arguments[1]) : result;
5952 * Gets the data for `map`.
5955 * @param {Object} map The map to query.
5956 * @param {string} key The reference key.
5957 * @returns {*} Returns the map data.
5959 function getMapData(map, key) {
5960 var data = map.__data__;
5961 return isKeyable(key)
5962 ? data[typeof key == 'string' ? 'string' : 'hash']
5967 * Gets the property names, values, and compare flags of `object`.
5970 * @param {Object} object The object to query.
5971 * @returns {Array} Returns the match data of `object`.
5973 function getMatchData(object) {
5974 var result = keys(object),
5975 length = result.length;
5978 var key = result[length],
5979 value = object[key];
5981 result[length] = [key, value, isStrictComparable(value)];
5987 * Gets the native function at `key` of `object`.
5990 * @param {Object} object The object to query.
5991 * @param {string} key The key of the method to get.
5992 * @returns {*} Returns the function if it's native, else `undefined`.
5994 function getNative(object, key) {
5995 var value = getValue(object, key);
5996 return baseIsNative(value) ? value : undefined;
6000 * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
6003 * @param {*} value The value to query.
6004 * @returns {string} Returns the raw `toStringTag`.
6006 function getRawTag(value) {
6007 var isOwn = hasOwnProperty.call(value, symToStringTag),
6008 tag = value[symToStringTag];
6011 value[symToStringTag] = undefined;
6012 var unmasked = true;
6015 var result = nativeObjectToString.call(value);
6018 value[symToStringTag] = tag;
6020 delete value[symToStringTag];
6027 * Creates an array of the own enumerable symbols of `object`.
6030 * @param {Object} object The object to query.
6031 * @returns {Array} Returns the array of symbols.
6033 var getSymbols = !nativeGetSymbols ? stubArray : function(object) {
6034 if (object == null) {
6037 object = Object(object);
6038 return arrayFilter(nativeGetSymbols(object), function(symbol) {
6039 return propertyIsEnumerable.call(object, symbol);
6044 * Creates an array of the own and inherited enumerable symbols of `object`.
6047 * @param {Object} object The object to query.
6048 * @returns {Array} Returns the array of symbols.
6050 var getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {
6053 arrayPush(result, getSymbols(object));
6054 object = getPrototype(object);
6060 * Gets the `toStringTag` of `value`.
6063 * @param {*} value The value to query.
6064 * @returns {string} Returns the `toStringTag`.
6066 var getTag = baseGetTag;
6068 // Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.
6069 if ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||
6070 (Map && getTag(new Map) != mapTag) ||
6071 (Promise && getTag(Promise.resolve()) != promiseTag) ||
6072 (Set && getTag(new Set) != setTag) ||
6073 (WeakMap && getTag(new WeakMap) != weakMapTag)) {
6074 getTag = function(value) {
6075 var result = baseGetTag(value),
6076 Ctor = result == objectTag ? value.constructor : undefined,
6077 ctorString = Ctor ? toSource(Ctor) : '';
6080 switch (ctorString) {
6081 case dataViewCtorString: return dataViewTag;
6082 case mapCtorString: return mapTag;
6083 case promiseCtorString: return promiseTag;
6084 case setCtorString: return setTag;
6085 case weakMapCtorString: return weakMapTag;
6093 * Gets the view, applying any `transforms` to the `start` and `end` positions.
6096 * @param {number} start The start of the view.
6097 * @param {number} end The end of the view.
6098 * @param {Array} transforms The transformations to apply to the view.
6099 * @returns {Object} Returns an object containing the `start` and `end`
6100 * positions of the view.
6102 function getView(start, end, transforms) {
6104 length = transforms.length;
6106 while (++index < length) {
6107 var data = transforms[index],
6110 switch (data.type) {
6111 case 'drop': start += size; break;
6112 case 'dropRight': end -= size; break;
6113 case 'take': end = nativeMin(end, start + size); break;
6114 case 'takeRight': start = nativeMax(start, end - size); break;
6117 return { 'start': start, 'end': end };
6121 * Extracts wrapper details from the `source` body comment.
6124 * @param {string} source The source to inspect.
6125 * @returns {Array} Returns the wrapper details.
6127 function getWrapDetails(source) {
6128 var match = source.match(reWrapDetails);
6129 return match ? match[1].split(reSplitDetails) : [];
6133 * Checks if `path` exists on `object`.
6136 * @param {Object} object The object to query.
6137 * @param {Array|string} path The path to check.
6138 * @param {Function} hasFunc The function to check properties.
6139 * @returns {boolean} Returns `true` if `path` exists, else `false`.
6141 function hasPath(object, path, hasFunc) {
6142 path = castPath(path, object);
6145 length = path.length,
6148 while (++index < length) {
6149 var key = toKey(path[index]);
6150 if (!(result = object != null && hasFunc(object, key))) {
6153 object = object[key];
6155 if (result || ++index != length) {
6158 length = object == null ? 0 : object.length;
6159 return !!length && isLength(length) && isIndex(key, length) &&
6160 (isArray(object) || isArguments(object));
6164 * Initializes an array clone.
6167 * @param {Array} array The array to clone.
6168 * @returns {Array} Returns the initialized clone.
6170 function initCloneArray(array) {
6171 var length = array.length,
6172 result = new array.constructor(length);
6174 // Add properties assigned by `RegExp#exec`.
6175 if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {
6176 result.index = array.index;
6177 result.input = array.input;
6183 * Initializes an object clone.
6186 * @param {Object} object The object to clone.
6187 * @returns {Object} Returns the initialized clone.
6189 function initCloneObject(object) {
6190 return (typeof object.constructor == 'function' && !isPrototype(object))
6191 ? baseCreate(getPrototype(object))
6196 * Initializes an object clone based on its `toStringTag`.
6198 * **Note:** This function only supports cloning values with tags of
6199 * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.
6202 * @param {Object} object The object to clone.
6203 * @param {string} tag The `toStringTag` of the object to clone.
6204 * @param {boolean} [isDeep] Specify a deep clone.
6205 * @returns {Object} Returns the initialized clone.
6207 function initCloneByTag(object, tag, isDeep) {
6208 var Ctor = object.constructor;
6210 case arrayBufferTag:
6211 return cloneArrayBuffer(object);
6215 return new Ctor(+object);
6218 return cloneDataView(object, isDeep);
6220 case float32Tag: case float64Tag:
6221 case int8Tag: case int16Tag: case int32Tag:
6222 case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
6223 return cloneTypedArray(object, isDeep);
6230 return new Ctor(object);
6233 return cloneRegExp(object);
6239 return cloneSymbol(object);
6244 * Inserts wrapper `details` in a comment at the top of the `source` body.
6247 * @param {string} source The source to modify.
6248 * @returns {Array} details The details to insert.
6249 * @returns {string} Returns the modified source.
6251 function insertWrapDetails(source, details) {
6252 var length = details.length;
6256 var lastIndex = length - 1;
6257 details[lastIndex] = (length > 1 ? '& ' : '') + details[lastIndex];
6258 details = details.join(length > 2 ? ', ' : ' ');
6259 return source.replace(reWrapComment, '{\n/* [wrapped with ' + details + '] */\n');
6263 * Checks if `value` is a flattenable `arguments` object or array.
6266 * @param {*} value The value to check.
6267 * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.
6269 function isFlattenable(value) {
6270 return isArray(value) || isArguments(value) ||
6271 !!(spreadableSymbol && value && value[spreadableSymbol]);
6275 * Checks if `value` is a valid array-like index.
6278 * @param {*} value The value to check.
6279 * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.
6280 * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.
6282 function isIndex(value, length) {
6283 var type = typeof value;
6284 length = length == null ? MAX_SAFE_INTEGER : length;
6287 (type == 'number' ||
6288 (type != 'symbol' && reIsUint.test(value))) &&
6289 (value > -1 && value % 1 == 0 && value < length);
6293 * Checks if the given arguments are from an iteratee call.
6296 * @param {*} value The potential iteratee value argument.
6297 * @param {*} index The potential iteratee index or key argument.
6298 * @param {*} object The potential iteratee object argument.
6299 * @returns {boolean} Returns `true` if the arguments are from an iteratee call,
6302 function isIterateeCall(value, index, object) {
6303 if (!isObject(object)) {
6306 var type = typeof index;
6307 if (type == 'number'
6308 ? (isArrayLike(object) && isIndex(index, object.length))
6309 : (type == 'string' && index in object)
6311 return eq(object[index], value);
6317 * Checks if `value` is a property name and not a property path.
6320 * @param {*} value The value to check.
6321 * @param {Object} [object] The object to query keys on.
6322 * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
6324 function isKey(value, object) {
6325 if (isArray(value)) {
6328 var type = typeof value;
6329 if (type == 'number' || type == 'symbol' || type == 'boolean' ||
6330 value == null || isSymbol(value)) {
6333 return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
6334 (object != null && value in Object(object));
6338 * Checks if `value` is suitable for use as unique object key.
6341 * @param {*} value The value to check.
6342 * @returns {boolean} Returns `true` if `value` is suitable, else `false`.
6344 function isKeyable(value) {
6345 var type = typeof value;
6346 return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')
6347 ? (value !== '__proto__')
6352 * Checks if `func` has a lazy counterpart.
6355 * @param {Function} func The function to check.
6356 * @returns {boolean} Returns `true` if `func` has a lazy counterpart,
6359 function isLaziable(func) {
6360 var funcName = getFuncName(func),
6361 other = lodash[funcName];
6363 if (typeof other != 'function' || !(funcName in LazyWrapper.prototype)) {
6366 if (func === other) {
6369 var data = getData(other);
6370 return !!data && func === data[0];
6374 * Checks if `func` has its source masked.
6377 * @param {Function} func The function to check.
6378 * @returns {boolean} Returns `true` if `func` is masked, else `false`.
6380 function isMasked(func) {
6381 return !!maskSrcKey && (maskSrcKey in func);
6385 * Checks if `func` is capable of being masked.
6388 * @param {*} value The value to check.
6389 * @returns {boolean} Returns `true` if `func` is maskable, else `false`.
6391 var isMaskable = coreJsData ? isFunction : stubFalse;
6394 * Checks if `value` is likely a prototype object.
6397 * @param {*} value The value to check.
6398 * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.
6400 function isPrototype(value) {
6401 var Ctor = value && value.constructor,
6402 proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;
6404 return value === proto;
6408 * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.
6411 * @param {*} value The value to check.
6412 * @returns {boolean} Returns `true` if `value` if suitable for strict
6413 * equality comparisons, else `false`.
6415 function isStrictComparable(value) {
6416 return value === value && !isObject(value);
6420 * A specialized version of `matchesProperty` for source values suitable
6421 * for strict equality comparisons, i.e. `===`.
6424 * @param {string} key The key of the property to get.
6425 * @param {*} srcValue The value to match.
6426 * @returns {Function} Returns the new spec function.
6428 function matchesStrictComparable(key, srcValue) {
6429 return function(object) {
6430 if (object == null) {
6433 return object[key] === srcValue &&
6434 (srcValue !== undefined || (key in Object(object)));
6439 * A specialized version of `_.memoize` which clears the memoized function's
6440 * cache when it exceeds `MAX_MEMOIZE_SIZE`.
6443 * @param {Function} func The function to have its output memoized.
6444 * @returns {Function} Returns the new memoized function.
6446 function memoizeCapped(func) {
6447 var result = memoize(func, function(key) {
6448 if (cache.size === MAX_MEMOIZE_SIZE) {
6454 var cache = result.cache;
6459 * Merges the function metadata of `source` into `data`.
6461 * Merging metadata reduces the number of wrappers used to invoke a function.
6462 * This is possible because methods like `_.bind`, `_.curry`, and `_.partial`
6463 * may be applied regardless of execution order. Methods like `_.ary` and
6464 * `_.rearg` modify function arguments, making the order in which they are
6465 * executed important, preventing the merging of metadata. However, we make
6466 * an exception for a safe combined case where curried functions have `_.ary`
6467 * and or `_.rearg` applied.
6470 * @param {Array} data The destination metadata.
6471 * @param {Array} source The source metadata.
6472 * @returns {Array} Returns `data`.
6474 function mergeData(data, source) {
6475 var bitmask = data[1],
6476 srcBitmask = source[1],
6477 newBitmask = bitmask | srcBitmask,
6478 isCommon = newBitmask < (WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG | WRAP_ARY_FLAG);
6481 ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_CURRY_FLAG)) ||
6482 ((srcBitmask == WRAP_ARY_FLAG) && (bitmask == WRAP_REARG_FLAG) && (data[7].length <= source[8])) ||
6483 ((srcBitmask == (WRAP_ARY_FLAG | WRAP_REARG_FLAG)) && (source[7].length <= source[8]) && (bitmask == WRAP_CURRY_FLAG));
6485 // Exit early if metadata can't be merged.
6486 if (!(isCommon || isCombo)) {
6489 // Use source `thisArg` if available.
6490 if (srcBitmask & WRAP_BIND_FLAG) {
6491 data[2] = source[2];
6492 // Set when currying a bound function.
6493 newBitmask |= bitmask & WRAP_BIND_FLAG ? 0 : WRAP_CURRY_BOUND_FLAG;
6495 // Compose partial arguments.
6496 var value = source[3];
6498 var partials = data[3];
6499 data[3] = partials ? composeArgs(partials, value, source[4]) : value;
6500 data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : source[4];
6502 // Compose partial right arguments.
6506 data[5] = partials ? composeArgsRight(partials, value, source[6]) : value;
6507 data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : source[6];
6509 // Use source `argPos` if available.
6514 // Use source `ary` if it's smaller.
6515 if (srcBitmask & WRAP_ARY_FLAG) {
6516 data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]);
6518 // Use source `arity` if one is not provided.
6519 if (data[9] == null) {
6520 data[9] = source[9];
6522 // Use source `func` and merge bitmasks.
6523 data[0] = source[0];
6524 data[1] = newBitmask;
6530 * This function is like
6531 * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
6532 * except that it includes inherited enumerable properties.
6535 * @param {Object} object The object to query.
6536 * @returns {Array} Returns the array of property names.
6538 function nativeKeysIn(object) {
6540 if (object != null) {
6541 for (var key in Object(object)) {
6549 * Converts `value` to a string using `Object.prototype.toString`.
6552 * @param {*} value The value to convert.
6553 * @returns {string} Returns the converted string.
6555 function objectToString(value) {
6556 return nativeObjectToString.call(value);
6560 * A specialized version of `baseRest` which transforms the rest array.
6563 * @param {Function} func The function to apply a rest parameter to.
6564 * @param {number} [start=func.length-1] The start position of the rest parameter.
6565 * @param {Function} transform The rest array transform.
6566 * @returns {Function} Returns the new function.
6568 function overRest(func, start, transform) {
6569 start = nativeMax(start === undefined ? (func.length - 1) : start, 0);
6571 var args = arguments,
6573 length = nativeMax(args.length - start, 0),
6574 array = Array(length);
6576 while (++index < length) {
6577 array[index] = args[start + index];
6580 var otherArgs = Array(start + 1);
6581 while (++index < start) {
6582 otherArgs[index] = args[index];
6584 otherArgs[start] = transform(array);
6585 return apply(func, this, otherArgs);
6590 * Gets the parent value at `path` of `object`.
6593 * @param {Object} object The object to query.
6594 * @param {Array} path The path to get the parent value of.
6595 * @returns {*} Returns the parent value.
6597 function parent(object, path) {
6598 return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));
6602 * Reorder `array` according to the specified indexes where the element at
6603 * the first index is assigned as the first element, the element at
6604 * the second index is assigned as the second element, and so on.
6607 * @param {Array} array The array to reorder.
6608 * @param {Array} indexes The arranged array indexes.
6609 * @returns {Array} Returns `array`.
6611 function reorder(array, indexes) {
6612 var arrLength = array.length,
6613 length = nativeMin(indexes.length, arrLength),
6614 oldArray = copyArray(array);
6617 var index = indexes[length];
6618 array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined;
6624 * Gets the value at `key`, unless `key` is "__proto__" or "constructor".
6627 * @param {Object} object The object to query.
6628 * @param {string} key The key of the property to get.
6629 * @returns {*} Returns the property value.
6631 function safeGet(object, key) {
6632 if (key === 'constructor' && typeof object[key] === 'function') {
6636 if (key == '__proto__') {
6644 * Sets metadata for `func`.
6646 * **Note:** If this function becomes hot, i.e. is invoked a lot in a short
6647 * period of time, it will trip its breaker and transition to an identity
6648 * function to avoid garbage collection pauses in V8. See
6649 * [V8 issue 2070](https://bugs.chromium.org/p/v8/issues/detail?id=2070)
6653 * @param {Function} func The function to associate metadata with.
6654 * @param {*} data The metadata.
6655 * @returns {Function} Returns `func`.
6657 var setData = shortOut(baseSetData);
6660 * A simple wrapper around the global [`setTimeout`](https://mdn.io/setTimeout).
6663 * @param {Function} func The function to delay.
6664 * @param {number} wait The number of milliseconds to delay invocation.
6665 * @returns {number|Object} Returns the timer id or timeout object.
6667 var setTimeout = ctxSetTimeout || function(func, wait) {
6668 return root.setTimeout(func, wait);
6672 * Sets the `toString` method of `func` to return `string`.
6675 * @param {Function} func The function to modify.
6676 * @param {Function} string The `toString` result.
6677 * @returns {Function} Returns `func`.
6679 var setToString = shortOut(baseSetToString);
6682 * Sets the `toString` method of `wrapper` to mimic the source of `reference`
6683 * with wrapper details in a comment at the top of the source body.
6686 * @param {Function} wrapper The function to modify.
6687 * @param {Function} reference The reference function.
6688 * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
6689 * @returns {Function} Returns `wrapper`.
6691 function setWrapToString(wrapper, reference, bitmask) {
6692 var source = (reference + '');
6693 return setToString(wrapper, insertWrapDetails(source, updateWrapDetails(getWrapDetails(source), bitmask)));
6697 * Creates a function that'll short out and invoke `identity` instead
6698 * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
6702 * @param {Function} func The function to restrict.
6703 * @returns {Function} Returns the new shortable function.
6705 function shortOut(func) {
6710 var stamp = nativeNow(),
6711 remaining = HOT_SPAN - (stamp - lastCalled);
6714 if (remaining > 0) {
6715 if (++count >= HOT_COUNT) {
6716 return arguments[0];
6721 return func.apply(undefined, arguments);
6726 * A specialized version of `_.shuffle` which mutates and sets the size of `array`.
6729 * @param {Array} array The array to shuffle.
6730 * @param {number} [size=array.length] The size of `array`.
6731 * @returns {Array} Returns `array`.
6733 function shuffleSelf(array, size) {
6735 length = array.length,
6736 lastIndex = length - 1;
6738 size = size === undefined ? length : size;
6739 while (++index < size) {
6740 var rand = baseRandom(index, lastIndex),
6741 value = array[rand];
6743 array[rand] = array[index];
6744 array[index] = value;
6746 array.length = size;
6751 * Converts `string` to a property path array.
6754 * @param {string} string The string to convert.
6755 * @returns {Array} Returns the property path array.
6757 var stringToPath = memoizeCapped(function(string) {
6759 if (string.charCodeAt(0) === 46 /* . */) {
6762 string.replace(rePropName, function(match, number, quote, subString) {
6763 result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));
6769 * Converts `value` to a string key if it's not a string or symbol.
6772 * @param {*} value The value to inspect.
6773 * @returns {string|symbol} Returns the key.
6775 function toKey(value) {
6776 if (typeof value == 'string' || isSymbol(value)) {
6779 var result = (value + '');
6780 return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;
6784 * Converts `func` to its source code.
6787 * @param {Function} func The function to convert.
6788 * @returns {string} Returns the source code.
6790 function toSource(func) {
6793 return funcToString.call(func);
6803 * Updates wrapper `details` based on `bitmask` flags.
6806 * @returns {Array} details The details to modify.
6807 * @param {number} bitmask The bitmask flags. See `createWrap` for more details.
6808 * @returns {Array} Returns `details`.
6810 function updateWrapDetails(details, bitmask) {
6811 arrayEach(wrapFlags, function(pair) {
6812 var value = '_.' + pair[0];
6813 if ((bitmask & pair[1]) && !arrayIncludes(details, value)) {
6814 details.push(value);
6817 return details.sort();
6821 * Creates a clone of `wrapper`.
6824 * @param {Object} wrapper The wrapper to clone.
6825 * @returns {Object} Returns the cloned wrapper.
6827 function wrapperClone(wrapper) {
6828 if (wrapper instanceof LazyWrapper) {
6829 return wrapper.clone();
6831 var result = new LodashWrapper(wrapper.__wrapped__, wrapper.__chain__);
6832 result.__actions__ = copyArray(wrapper.__actions__);
6833 result.__index__ = wrapper.__index__;
6834 result.__values__ = wrapper.__values__;
6838 /*------------------------------------------------------------------------*/
6841 * Creates an array of elements split into groups the length of `size`.
6842 * If `array` can't be split evenly, the final chunk will be the remaining
6849 * @param {Array} array The array to process.
6850 * @param {number} [size=1] The length of each chunk
6851 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
6852 * @returns {Array} Returns the new array of chunks.
6855 * _.chunk(['a', 'b', 'c', 'd'], 2);
6856 * // => [['a', 'b'], ['c', 'd']]
6858 * _.chunk(['a', 'b', 'c', 'd'], 3);
6859 * // => [['a', 'b', 'c'], ['d']]
6861 function chunk(array, size, guard) {
6862 if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {
6865 size = nativeMax(toInteger(size), 0);
6867 var length = array == null ? 0 : array.length;
6868 if (!length || size < 1) {
6873 result = Array(nativeCeil(length / size));
6875 while (index < length) {
6876 result[resIndex++] = baseSlice(array, index, (index += size));
6882 * Creates an array with all falsey values removed. The values `false`, `null`,
6883 * `0`, `""`, `undefined`, and `NaN` are falsey.
6889 * @param {Array} array The array to compact.
6890 * @returns {Array} Returns the new array of filtered values.
6893 * _.compact([0, 1, false, 2, '', 3]);
6896 function compact(array) {
6898 length = array == null ? 0 : array.length,
6902 while (++index < length) {
6903 var value = array[index];
6905 result[resIndex++] = value;
6912 * Creates a new array concatenating `array` with any additional arrays
6919 * @param {Array} array The array to concatenate.
6920 * @param {...*} [values] The values to concatenate.
6921 * @returns {Array} Returns the new concatenated array.
6925 * var other = _.concat(array, 2, [3], [[4]]);
6927 * console.log(other);
6928 * // => [1, 2, 3, [4]]
6930 * console.log(array);
6934 var length = arguments.length;
6938 var args = Array(length - 1),
6939 array = arguments[0],
6943 args[index - 1] = arguments[index];
6945 return arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1));
6949 * Creates an array of `array` values not included in the other given arrays
6950 * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
6951 * for equality comparisons. The order and references of result values are
6952 * determined by the first array.
6954 * **Note:** Unlike `_.pullAll`, this method returns a new array.
6960 * @param {Array} array The array to inspect.
6961 * @param {...Array} [values] The values to exclude.
6962 * @returns {Array} Returns the new array of filtered values.
6963 * @see _.without, _.xor
6966 * _.difference([2, 1], [2, 3]);
6969 var difference = baseRest(function(array, values) {
6970 return isArrayLikeObject(array)
6971 ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))
6976 * This method is like `_.difference` except that it accepts `iteratee` which
6977 * is invoked for each element of `array` and `values` to generate the criterion
6978 * by which they're compared. The order and references of result values are
6979 * determined by the first array. The iteratee is invoked with one argument:
6982 * **Note:** Unlike `_.pullAllBy`, this method returns a new array.
6988 * @param {Array} array The array to inspect.
6989 * @param {...Array} [values] The values to exclude.
6990 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
6991 * @returns {Array} Returns the new array of filtered values.
6994 * _.differenceBy([2.1, 1.2], [2.3, 3.4], Math.floor);
6997 * // The `_.property` iteratee shorthand.
6998 * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');
6999 * // => [{ 'x': 2 }]
7001 var differenceBy = baseRest(function(array, values) {
7002 var iteratee = last(values);
7003 if (isArrayLikeObject(iteratee)) {
7004 iteratee = undefined;
7006 return isArrayLikeObject(array)
7007 ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), getIteratee(iteratee, 2))
7012 * This method is like `_.difference` except that it accepts `comparator`
7013 * which is invoked to compare elements of `array` to `values`. The order and
7014 * references of result values are determined by the first array. The comparator
7015 * is invoked with two arguments: (arrVal, othVal).
7017 * **Note:** Unlike `_.pullAllWith`, this method returns a new array.
7023 * @param {Array} array The array to inspect.
7024 * @param {...Array} [values] The values to exclude.
7025 * @param {Function} [comparator] The comparator invoked per element.
7026 * @returns {Array} Returns the new array of filtered values.
7029 * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
7031 * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);
7032 * // => [{ 'x': 2, 'y': 1 }]
7034 var differenceWith = baseRest(function(array, values) {
7035 var comparator = last(values);
7036 if (isArrayLikeObject(comparator)) {
7037 comparator = undefined;
7039 return isArrayLikeObject(array)
7040 ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)
7045 * Creates a slice of `array` with `n` elements dropped from the beginning.
7051 * @param {Array} array The array to query.
7052 * @param {number} [n=1] The number of elements to drop.
7053 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
7054 * @returns {Array} Returns the slice of `array`.
7057 * _.drop([1, 2, 3]);
7060 * _.drop([1, 2, 3], 2);
7063 * _.drop([1, 2, 3], 5);
7066 * _.drop([1, 2, 3], 0);
7069 function drop(array, n, guard) {
7070 var length = array == null ? 0 : array.length;
7074 n = (guard || n === undefined) ? 1 : toInteger(n);
7075 return baseSlice(array, n < 0 ? 0 : n, length);
7079 * Creates a slice of `array` with `n` elements dropped from the end.
7085 * @param {Array} array The array to query.
7086 * @param {number} [n=1] The number of elements to drop.
7087 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
7088 * @returns {Array} Returns the slice of `array`.
7091 * _.dropRight([1, 2, 3]);
7094 * _.dropRight([1, 2, 3], 2);
7097 * _.dropRight([1, 2, 3], 5);
7100 * _.dropRight([1, 2, 3], 0);
7103 function dropRight(array, n, guard) {
7104 var length = array == null ? 0 : array.length;
7108 n = (guard || n === undefined) ? 1 : toInteger(n);
7110 return baseSlice(array, 0, n < 0 ? 0 : n);
7114 * Creates a slice of `array` excluding elements dropped from the end.
7115 * Elements are dropped until `predicate` returns falsey. The predicate is
7116 * invoked with three arguments: (value, index, array).
7122 * @param {Array} array The array to query.
7123 * @param {Function} [predicate=_.identity] The function invoked per iteration.
7124 * @returns {Array} Returns the slice of `array`.
7128 * { 'user': 'barney', 'active': true },
7129 * { 'user': 'fred', 'active': false },
7130 * { 'user': 'pebbles', 'active': false }
7133 * _.dropRightWhile(users, function(o) { return !o.active; });
7134 * // => objects for ['barney']
7136 * // The `_.matches` iteratee shorthand.
7137 * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });
7138 * // => objects for ['barney', 'fred']
7140 * // The `_.matchesProperty` iteratee shorthand.
7141 * _.dropRightWhile(users, ['active', false]);
7142 * // => objects for ['barney']
7144 * // The `_.property` iteratee shorthand.
7145 * _.dropRightWhile(users, 'active');
7146 * // => objects for ['barney', 'fred', 'pebbles']
7148 function dropRightWhile(array, predicate) {
7149 return (array && array.length)
7150 ? baseWhile(array, getIteratee(predicate, 3), true, true)
7155 * Creates a slice of `array` excluding elements dropped from the beginning.
7156 * Elements are dropped until `predicate` returns falsey. The predicate is
7157 * invoked with three arguments: (value, index, array).
7163 * @param {Array} array The array to query.
7164 * @param {Function} [predicate=_.identity] The function invoked per iteration.
7165 * @returns {Array} Returns the slice of `array`.
7169 * { 'user': 'barney', 'active': false },
7170 * { 'user': 'fred', 'active': false },
7171 * { 'user': 'pebbles', 'active': true }
7174 * _.dropWhile(users, function(o) { return !o.active; });
7175 * // => objects for ['pebbles']
7177 * // The `_.matches` iteratee shorthand.
7178 * _.dropWhile(users, { 'user': 'barney', 'active': false });
7179 * // => objects for ['fred', 'pebbles']
7181 * // The `_.matchesProperty` iteratee shorthand.
7182 * _.dropWhile(users, ['active', false]);
7183 * // => objects for ['pebbles']
7185 * // The `_.property` iteratee shorthand.
7186 * _.dropWhile(users, 'active');
7187 * // => objects for ['barney', 'fred', 'pebbles']
7189 function dropWhile(array, predicate) {
7190 return (array && array.length)
7191 ? baseWhile(array, getIteratee(predicate, 3), true)
7196 * Fills elements of `array` with `value` from `start` up to, but not
7199 * **Note:** This method mutates `array`.
7205 * @param {Array} array The array to fill.
7206 * @param {*} value The value to fill `array` with.
7207 * @param {number} [start=0] The start position.
7208 * @param {number} [end=array.length] The end position.
7209 * @returns {Array} Returns `array`.
7212 * var array = [1, 2, 3];
7214 * _.fill(array, 'a');
7215 * console.log(array);
7216 * // => ['a', 'a', 'a']
7218 * _.fill(Array(3), 2);
7221 * _.fill([4, 6, 8, 10], '*', 1, 3);
7222 * // => [4, '*', '*', 10]
7224 function fill(array, value, start, end) {
7225 var length = array == null ? 0 : array.length;
7229 if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {
7233 return baseFill(array, value, start, end);
7237 * This method is like `_.find` except that it returns the index of the first
7238 * element `predicate` returns truthy for instead of the element itself.
7244 * @param {Array} array The array to inspect.
7245 * @param {Function} [predicate=_.identity] The function invoked per iteration.
7246 * @param {number} [fromIndex=0] The index to search from.
7247 * @returns {number} Returns the index of the found element, else `-1`.
7251 * { 'user': 'barney', 'active': false },
7252 * { 'user': 'fred', 'active': false },
7253 * { 'user': 'pebbles', 'active': true }
7256 * _.findIndex(users, function(o) { return o.user == 'barney'; });
7259 * // The `_.matches` iteratee shorthand.
7260 * _.findIndex(users, { 'user': 'fred', 'active': false });
7263 * // The `_.matchesProperty` iteratee shorthand.
7264 * _.findIndex(users, ['active', false]);
7267 * // The `_.property` iteratee shorthand.
7268 * _.findIndex(users, 'active');
7271 function findIndex(array, predicate, fromIndex) {
7272 var length = array == null ? 0 : array.length;
7276 var index = fromIndex == null ? 0 : toInteger(fromIndex);
7278 index = nativeMax(length + index, 0);
7280 return baseFindIndex(array, getIteratee(predicate, 3), index);
7284 * This method is like `_.findIndex` except that it iterates over elements
7285 * of `collection` from right to left.
7291 * @param {Array} array The array to inspect.
7292 * @param {Function} [predicate=_.identity] The function invoked per iteration.
7293 * @param {number} [fromIndex=array.length-1] The index to search from.
7294 * @returns {number} Returns the index of the found element, else `-1`.
7298 * { 'user': 'barney', 'active': true },
7299 * { 'user': 'fred', 'active': false },
7300 * { 'user': 'pebbles', 'active': false }
7303 * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });
7306 * // The `_.matches` iteratee shorthand.
7307 * _.findLastIndex(users, { 'user': 'barney', 'active': true });
7310 * // The `_.matchesProperty` iteratee shorthand.
7311 * _.findLastIndex(users, ['active', false]);
7314 * // The `_.property` iteratee shorthand.
7315 * _.findLastIndex(users, 'active');
7318 function findLastIndex(array, predicate, fromIndex) {
7319 var length = array == null ? 0 : array.length;
7323 var index = length - 1;
7324 if (fromIndex !== undefined) {
7325 index = toInteger(fromIndex);
7326 index = fromIndex < 0
7327 ? nativeMax(length + index, 0)
7328 : nativeMin(index, length - 1);
7330 return baseFindIndex(array, getIteratee(predicate, 3), index, true);
7334 * Flattens `array` a single level deep.
7340 * @param {Array} array The array to flatten.
7341 * @returns {Array} Returns the new flattened array.
7344 * _.flatten([1, [2, [3, [4]], 5]]);
7345 * // => [1, 2, [3, [4]], 5]
7347 function flatten(array) {
7348 var length = array == null ? 0 : array.length;
7349 return length ? baseFlatten(array, 1) : [];
7353 * Recursively flattens `array`.
7359 * @param {Array} array The array to flatten.
7360 * @returns {Array} Returns the new flattened array.
7363 * _.flattenDeep([1, [2, [3, [4]], 5]]);
7364 * // => [1, 2, 3, 4, 5]
7366 function flattenDeep(array) {
7367 var length = array == null ? 0 : array.length;
7368 return length ? baseFlatten(array, INFINITY) : [];
7372 * Recursively flatten `array` up to `depth` times.
7378 * @param {Array} array The array to flatten.
7379 * @param {number} [depth=1] The maximum recursion depth.
7380 * @returns {Array} Returns the new flattened array.
7383 * var array = [1, [2, [3, [4]], 5]];
7385 * _.flattenDepth(array, 1);
7386 * // => [1, 2, [3, [4]], 5]
7388 * _.flattenDepth(array, 2);
7389 * // => [1, 2, 3, [4], 5]
7391 function flattenDepth(array, depth) {
7392 var length = array == null ? 0 : array.length;
7396 depth = depth === undefined ? 1 : toInteger(depth);
7397 return baseFlatten(array, depth);
7401 * The inverse of `_.toPairs`; this method returns an object composed
7402 * from key-value `pairs`.
7408 * @param {Array} pairs The key-value pairs.
7409 * @returns {Object} Returns the new object.
7412 * _.fromPairs([['a', 1], ['b', 2]]);
7413 * // => { 'a': 1, 'b': 2 }
7415 function fromPairs(pairs) {
7417 length = pairs == null ? 0 : pairs.length,
7420 while (++index < length) {
7421 var pair = pairs[index];
7422 result[pair[0]] = pair[1];
7428 * Gets the first element of `array`.
7435 * @param {Array} array The array to query.
7436 * @returns {*} Returns the first element of `array`.
7439 * _.head([1, 2, 3]);
7445 function head(array) {
7446 return (array && array.length) ? array[0] : undefined;
7450 * Gets the index at which the first occurrence of `value` is found in `array`
7451 * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
7452 * for equality comparisons. If `fromIndex` is negative, it's used as the
7453 * offset from the end of `array`.
7459 * @param {Array} array The array to inspect.
7460 * @param {*} value The value to search for.
7461 * @param {number} [fromIndex=0] The index to search from.
7462 * @returns {number} Returns the index of the matched value, else `-1`.
7465 * _.indexOf([1, 2, 1, 2], 2);
7468 * // Search from the `fromIndex`.
7469 * _.indexOf([1, 2, 1, 2], 2, 2);
7472 function indexOf(array, value, fromIndex) {
7473 var length = array == null ? 0 : array.length;
7477 var index = fromIndex == null ? 0 : toInteger(fromIndex);
7479 index = nativeMax(length + index, 0);
7481 return baseIndexOf(array, value, index);
7485 * Gets all but the last element of `array`.
7491 * @param {Array} array The array to query.
7492 * @returns {Array} Returns the slice of `array`.
7495 * _.initial([1, 2, 3]);
7498 function initial(array) {
7499 var length = array == null ? 0 : array.length;
7500 return length ? baseSlice(array, 0, -1) : [];
7504 * Creates an array of unique values that are included in all given arrays
7505 * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
7506 * for equality comparisons. The order and references of result values are
7507 * determined by the first array.
7513 * @param {...Array} [arrays] The arrays to inspect.
7514 * @returns {Array} Returns the new array of intersecting values.
7517 * _.intersection([2, 1], [2, 3]);
7520 var intersection = baseRest(function(arrays) {
7521 var mapped = arrayMap(arrays, castArrayLikeObject);
7522 return (mapped.length && mapped[0] === arrays[0])
7523 ? baseIntersection(mapped)
7528 * This method is like `_.intersection` except that it accepts `iteratee`
7529 * which is invoked for each element of each `arrays` to generate the criterion
7530 * by which they're compared. The order and references of result values are
7531 * determined by the first array. The iteratee is invoked with one argument:
7538 * @param {...Array} [arrays] The arrays to inspect.
7539 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
7540 * @returns {Array} Returns the new array of intersecting values.
7543 * _.intersectionBy([2.1, 1.2], [2.3, 3.4], Math.floor);
7546 * // The `_.property` iteratee shorthand.
7547 * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
7548 * // => [{ 'x': 1 }]
7550 var intersectionBy = baseRest(function(arrays) {
7551 var iteratee = last(arrays),
7552 mapped = arrayMap(arrays, castArrayLikeObject);
7554 if (iteratee === last(mapped)) {
7555 iteratee = undefined;
7559 return (mapped.length && mapped[0] === arrays[0])
7560 ? baseIntersection(mapped, getIteratee(iteratee, 2))
7565 * This method is like `_.intersection` except that it accepts `comparator`
7566 * which is invoked to compare elements of `arrays`. The order and references
7567 * of result values are determined by the first array. The comparator is
7568 * invoked with two arguments: (arrVal, othVal).
7574 * @param {...Array} [arrays] The arrays to inspect.
7575 * @param {Function} [comparator] The comparator invoked per element.
7576 * @returns {Array} Returns the new array of intersecting values.
7579 * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
7580 * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
7582 * _.intersectionWith(objects, others, _.isEqual);
7583 * // => [{ 'x': 1, 'y': 2 }]
7585 var intersectionWith = baseRest(function(arrays) {
7586 var comparator = last(arrays),
7587 mapped = arrayMap(arrays, castArrayLikeObject);
7589 comparator = typeof comparator == 'function' ? comparator : undefined;
7593 return (mapped.length && mapped[0] === arrays[0])
7594 ? baseIntersection(mapped, undefined, comparator)
7599 * Converts all elements in `array` into a string separated by `separator`.
7605 * @param {Array} array The array to convert.
7606 * @param {string} [separator=','] The element separator.
7607 * @returns {string} Returns the joined string.
7610 * _.join(['a', 'b', 'c'], '~');
7613 function join(array, separator) {
7614 return array == null ? '' : nativeJoin.call(array, separator);
7618 * Gets the last element of `array`.
7624 * @param {Array} array The array to query.
7625 * @returns {*} Returns the last element of `array`.
7628 * _.last([1, 2, 3]);
7631 function last(array) {
7632 var length = array == null ? 0 : array.length;
7633 return length ? array[length - 1] : undefined;
7637 * This method is like `_.indexOf` except that it iterates over elements of
7638 * `array` from right to left.
7644 * @param {Array} array The array to inspect.
7645 * @param {*} value The value to search for.
7646 * @param {number} [fromIndex=array.length-1] The index to search from.
7647 * @returns {number} Returns the index of the matched value, else `-1`.
7650 * _.lastIndexOf([1, 2, 1, 2], 2);
7653 * // Search from the `fromIndex`.
7654 * _.lastIndexOf([1, 2, 1, 2], 2, 2);
7657 function lastIndexOf(array, value, fromIndex) {
7658 var length = array == null ? 0 : array.length;
7663 if (fromIndex !== undefined) {
7664 index = toInteger(fromIndex);
7665 index = index < 0 ? nativeMax(length + index, 0) : nativeMin(index, length - 1);
7667 return value === value
7668 ? strictLastIndexOf(array, value, index)
7669 : baseFindIndex(array, baseIsNaN, index, true);
7673 * Gets the element at index `n` of `array`. If `n` is negative, the nth
7674 * element from the end is returned.
7680 * @param {Array} array The array to query.
7681 * @param {number} [n=0] The index of the element to return.
7682 * @returns {*} Returns the nth element of `array`.
7685 * var array = ['a', 'b', 'c', 'd'];
7693 function nth(array, n) {
7694 return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;
7698 * Removes all given values from `array` using
7699 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
7700 * for equality comparisons.
7702 * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`
7703 * to remove elements from an array by predicate.
7709 * @param {Array} array The array to modify.
7710 * @param {...*} [values] The values to remove.
7711 * @returns {Array} Returns `array`.
7714 * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
7716 * _.pull(array, 'a', 'c');
7717 * console.log(array);
7720 var pull = baseRest(pullAll);
7723 * This method is like `_.pull` except that it accepts an array of values to remove.
7725 * **Note:** Unlike `_.difference`, this method mutates `array`.
7731 * @param {Array} array The array to modify.
7732 * @param {Array} values The values to remove.
7733 * @returns {Array} Returns `array`.
7736 * var array = ['a', 'b', 'c', 'a', 'b', 'c'];
7738 * _.pullAll(array, ['a', 'c']);
7739 * console.log(array);
7742 function pullAll(array, values) {
7743 return (array && array.length && values && values.length)
7744 ? basePullAll(array, values)
7749 * This method is like `_.pullAll` except that it accepts `iteratee` which is
7750 * invoked for each element of `array` and `values` to generate the criterion
7751 * by which they're compared. The iteratee is invoked with one argument: (value).
7753 * **Note:** Unlike `_.differenceBy`, this method mutates `array`.
7759 * @param {Array} array The array to modify.
7760 * @param {Array} values The values to remove.
7761 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
7762 * @returns {Array} Returns `array`.
7765 * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];
7767 * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');
7768 * console.log(array);
7769 * // => [{ 'x': 2 }]
7771 function pullAllBy(array, values, iteratee) {
7772 return (array && array.length && values && values.length)
7773 ? basePullAll(array, values, getIteratee(iteratee, 2))
7778 * This method is like `_.pullAll` except that it accepts `comparator` which
7779 * is invoked to compare elements of `array` to `values`. The comparator is
7780 * invoked with two arguments: (arrVal, othVal).
7782 * **Note:** Unlike `_.differenceWith`, this method mutates `array`.
7788 * @param {Array} array The array to modify.
7789 * @param {Array} values The values to remove.
7790 * @param {Function} [comparator] The comparator invoked per element.
7791 * @returns {Array} Returns `array`.
7794 * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];
7796 * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);
7797 * console.log(array);
7798 * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]
7800 function pullAllWith(array, values, comparator) {
7801 return (array && array.length && values && values.length)
7802 ? basePullAll(array, values, undefined, comparator)
7807 * Removes elements from `array` corresponding to `indexes` and returns an
7808 * array of removed elements.
7810 * **Note:** Unlike `_.at`, this method mutates `array`.
7816 * @param {Array} array The array to modify.
7817 * @param {...(number|number[])} [indexes] The indexes of elements to remove.
7818 * @returns {Array} Returns the new array of removed elements.
7821 * var array = ['a', 'b', 'c', 'd'];
7822 * var pulled = _.pullAt(array, [1, 3]);
7824 * console.log(array);
7827 * console.log(pulled);
7830 var pullAt = flatRest(function(array, indexes) {
7831 var length = array == null ? 0 : array.length,
7832 result = baseAt(array, indexes);
7834 basePullAt(array, arrayMap(indexes, function(index) {
7835 return isIndex(index, length) ? +index : index;
7836 }).sort(compareAscending));
7842 * Removes all elements from `array` that `predicate` returns truthy for
7843 * and returns an array of the removed elements. The predicate is invoked
7844 * with three arguments: (value, index, array).
7846 * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`
7847 * to pull elements from an array by value.
7853 * @param {Array} array The array to modify.
7854 * @param {Function} [predicate=_.identity] The function invoked per iteration.
7855 * @returns {Array} Returns the new array of removed elements.
7858 * var array = [1, 2, 3, 4];
7859 * var evens = _.remove(array, function(n) {
7860 * return n % 2 == 0;
7863 * console.log(array);
7866 * console.log(evens);
7869 function remove(array, predicate) {
7871 if (!(array && array.length)) {
7876 length = array.length;
7878 predicate = getIteratee(predicate, 3);
7879 while (++index < length) {
7880 var value = array[index];
7881 if (predicate(value, index, array)) {
7883 indexes.push(index);
7886 basePullAt(array, indexes);
7891 * Reverses `array` so that the first element becomes the last, the second
7892 * element becomes the second to last, and so on.
7894 * **Note:** This method mutates `array` and is based on
7895 * [`Array#reverse`](https://mdn.io/Array/reverse).
7901 * @param {Array} array The array to modify.
7902 * @returns {Array} Returns `array`.
7905 * var array = [1, 2, 3];
7910 * console.log(array);
7913 function reverse(array) {
7914 return array == null ? array : nativeReverse.call(array);
7918 * Creates a slice of `array` from `start` up to, but not including, `end`.
7920 * **Note:** This method is used instead of
7921 * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are
7928 * @param {Array} array The array to slice.
7929 * @param {number} [start=0] The start position.
7930 * @param {number} [end=array.length] The end position.
7931 * @returns {Array} Returns the slice of `array`.
7933 function slice(array, start, end) {
7934 var length = array == null ? 0 : array.length;
7938 if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {
7943 start = start == null ? 0 : toInteger(start);
7944 end = end === undefined ? length : toInteger(end);
7946 return baseSlice(array, start, end);
7950 * Uses a binary search to determine the lowest index at which `value`
7951 * should be inserted into `array` in order to maintain its sort order.
7957 * @param {Array} array The sorted array to inspect.
7958 * @param {*} value The value to evaluate.
7959 * @returns {number} Returns the index at which `value` should be inserted
7963 * _.sortedIndex([30, 50], 40);
7966 function sortedIndex(array, value) {
7967 return baseSortedIndex(array, value);
7971 * This method is like `_.sortedIndex` except that it accepts `iteratee`
7972 * which is invoked for `value` and each element of `array` to compute their
7973 * sort ranking. The iteratee is invoked with one argument: (value).
7979 * @param {Array} array The sorted array to inspect.
7980 * @param {*} value The value to evaluate.
7981 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
7982 * @returns {number} Returns the index at which `value` should be inserted
7986 * var objects = [{ 'x': 4 }, { 'x': 5 }];
7988 * _.sortedIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
7991 * // The `_.property` iteratee shorthand.
7992 * _.sortedIndexBy(objects, { 'x': 4 }, 'x');
7995 function sortedIndexBy(array, value, iteratee) {
7996 return baseSortedIndexBy(array, value, getIteratee(iteratee, 2));
8000 * This method is like `_.indexOf` except that it performs a binary
8001 * search on a sorted `array`.
8007 * @param {Array} array The array to inspect.
8008 * @param {*} value The value to search for.
8009 * @returns {number} Returns the index of the matched value, else `-1`.
8012 * _.sortedIndexOf([4, 5, 5, 5, 6], 5);
8015 function sortedIndexOf(array, value) {
8016 var length = array == null ? 0 : array.length;
8018 var index = baseSortedIndex(array, value);
8019 if (index < length && eq(array[index], value)) {
8027 * This method is like `_.sortedIndex` except that it returns the highest
8028 * index at which `value` should be inserted into `array` in order to
8029 * maintain its sort order.
8035 * @param {Array} array The sorted array to inspect.
8036 * @param {*} value The value to evaluate.
8037 * @returns {number} Returns the index at which `value` should be inserted
8041 * _.sortedLastIndex([4, 5, 5, 5, 6], 5);
8044 function sortedLastIndex(array, value) {
8045 return baseSortedIndex(array, value, true);
8049 * This method is like `_.sortedLastIndex` except that it accepts `iteratee`
8050 * which is invoked for `value` and each element of `array` to compute their
8051 * sort ranking. The iteratee is invoked with one argument: (value).
8057 * @param {Array} array The sorted array to inspect.
8058 * @param {*} value The value to evaluate.
8059 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
8060 * @returns {number} Returns the index at which `value` should be inserted
8064 * var objects = [{ 'x': 4 }, { 'x': 5 }];
8066 * _.sortedLastIndexBy(objects, { 'x': 4 }, function(o) { return o.x; });
8069 * // The `_.property` iteratee shorthand.
8070 * _.sortedLastIndexBy(objects, { 'x': 4 }, 'x');
8073 function sortedLastIndexBy(array, value, iteratee) {
8074 return baseSortedIndexBy(array, value, getIteratee(iteratee, 2), true);
8078 * This method is like `_.lastIndexOf` except that it performs a binary
8079 * search on a sorted `array`.
8085 * @param {Array} array The array to inspect.
8086 * @param {*} value The value to search for.
8087 * @returns {number} Returns the index of the matched value, else `-1`.
8090 * _.sortedLastIndexOf([4, 5, 5, 5, 6], 5);
8093 function sortedLastIndexOf(array, value) {
8094 var length = array == null ? 0 : array.length;
8096 var index = baseSortedIndex(array, value, true) - 1;
8097 if (eq(array[index], value)) {
8105 * This method is like `_.uniq` except that it's designed and optimized
8106 * for sorted arrays.
8112 * @param {Array} array The array to inspect.
8113 * @returns {Array} Returns the new duplicate free array.
8116 * _.sortedUniq([1, 1, 2]);
8119 function sortedUniq(array) {
8120 return (array && array.length)
8121 ? baseSortedUniq(array)
8126 * This method is like `_.uniqBy` except that it's designed and optimized
8127 * for sorted arrays.
8133 * @param {Array} array The array to inspect.
8134 * @param {Function} [iteratee] The iteratee invoked per element.
8135 * @returns {Array} Returns the new duplicate free array.
8138 * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);
8141 function sortedUniqBy(array, iteratee) {
8142 return (array && array.length)
8143 ? baseSortedUniq(array, getIteratee(iteratee, 2))
8148 * Gets all but the first element of `array`.
8154 * @param {Array} array The array to query.
8155 * @returns {Array} Returns the slice of `array`.
8158 * _.tail([1, 2, 3]);
8161 function tail(array) {
8162 var length = array == null ? 0 : array.length;
8163 return length ? baseSlice(array, 1, length) : [];
8167 * Creates a slice of `array` with `n` elements taken from the beginning.
8173 * @param {Array} array The array to query.
8174 * @param {number} [n=1] The number of elements to take.
8175 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
8176 * @returns {Array} Returns the slice of `array`.
8179 * _.take([1, 2, 3]);
8182 * _.take([1, 2, 3], 2);
8185 * _.take([1, 2, 3], 5);
8188 * _.take([1, 2, 3], 0);
8191 function take(array, n, guard) {
8192 if (!(array && array.length)) {
8195 n = (guard || n === undefined) ? 1 : toInteger(n);
8196 return baseSlice(array, 0, n < 0 ? 0 : n);
8200 * Creates a slice of `array` with `n` elements taken from the end.
8206 * @param {Array} array The array to query.
8207 * @param {number} [n=1] The number of elements to take.
8208 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
8209 * @returns {Array} Returns the slice of `array`.
8212 * _.takeRight([1, 2, 3]);
8215 * _.takeRight([1, 2, 3], 2);
8218 * _.takeRight([1, 2, 3], 5);
8221 * _.takeRight([1, 2, 3], 0);
8224 function takeRight(array, n, guard) {
8225 var length = array == null ? 0 : array.length;
8229 n = (guard || n === undefined) ? 1 : toInteger(n);
8231 return baseSlice(array, n < 0 ? 0 : n, length);
8235 * Creates a slice of `array` with elements taken from the end. Elements are
8236 * taken until `predicate` returns falsey. The predicate is invoked with
8237 * three arguments: (value, index, array).
8243 * @param {Array} array The array to query.
8244 * @param {Function} [predicate=_.identity] The function invoked per iteration.
8245 * @returns {Array} Returns the slice of `array`.
8249 * { 'user': 'barney', 'active': true },
8250 * { 'user': 'fred', 'active': false },
8251 * { 'user': 'pebbles', 'active': false }
8254 * _.takeRightWhile(users, function(o) { return !o.active; });
8255 * // => objects for ['fred', 'pebbles']
8257 * // The `_.matches` iteratee shorthand.
8258 * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });
8259 * // => objects for ['pebbles']
8261 * // The `_.matchesProperty` iteratee shorthand.
8262 * _.takeRightWhile(users, ['active', false]);
8263 * // => objects for ['fred', 'pebbles']
8265 * // The `_.property` iteratee shorthand.
8266 * _.takeRightWhile(users, 'active');
8269 function takeRightWhile(array, predicate) {
8270 return (array && array.length)
8271 ? baseWhile(array, getIteratee(predicate, 3), false, true)
8276 * Creates a slice of `array` with elements taken from the beginning. Elements
8277 * are taken until `predicate` returns falsey. The predicate is invoked with
8278 * three arguments: (value, index, array).
8284 * @param {Array} array The array to query.
8285 * @param {Function} [predicate=_.identity] The function invoked per iteration.
8286 * @returns {Array} Returns the slice of `array`.
8290 * { 'user': 'barney', 'active': false },
8291 * { 'user': 'fred', 'active': false },
8292 * { 'user': 'pebbles', 'active': true }
8295 * _.takeWhile(users, function(o) { return !o.active; });
8296 * // => objects for ['barney', 'fred']
8298 * // The `_.matches` iteratee shorthand.
8299 * _.takeWhile(users, { 'user': 'barney', 'active': false });
8300 * // => objects for ['barney']
8302 * // The `_.matchesProperty` iteratee shorthand.
8303 * _.takeWhile(users, ['active', false]);
8304 * // => objects for ['barney', 'fred']
8306 * // The `_.property` iteratee shorthand.
8307 * _.takeWhile(users, 'active');
8310 function takeWhile(array, predicate) {
8311 return (array && array.length)
8312 ? baseWhile(array, getIteratee(predicate, 3))
8317 * Creates an array of unique values, in order, from all given arrays using
8318 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
8319 * for equality comparisons.
8325 * @param {...Array} [arrays] The arrays to inspect.
8326 * @returns {Array} Returns the new array of combined values.
8329 * _.union([2], [1, 2]);
8332 var union = baseRest(function(arrays) {
8333 return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));
8337 * This method is like `_.union` except that it accepts `iteratee` which is
8338 * invoked for each element of each `arrays` to generate the criterion by
8339 * which uniqueness is computed. Result values are chosen from the first
8340 * array in which the value occurs. The iteratee is invoked with one argument:
8347 * @param {...Array} [arrays] The arrays to inspect.
8348 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
8349 * @returns {Array} Returns the new array of combined values.
8352 * _.unionBy([2.1], [1.2, 2.3], Math.floor);
8355 * // The `_.property` iteratee shorthand.
8356 * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
8357 * // => [{ 'x': 1 }, { 'x': 2 }]
8359 var unionBy = baseRest(function(arrays) {
8360 var iteratee = last(arrays);
8361 if (isArrayLikeObject(iteratee)) {
8362 iteratee = undefined;
8364 return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), getIteratee(iteratee, 2));
8368 * This method is like `_.union` except that it accepts `comparator` which
8369 * is invoked to compare elements of `arrays`. Result values are chosen from
8370 * the first array in which the value occurs. The comparator is invoked
8371 * with two arguments: (arrVal, othVal).
8377 * @param {...Array} [arrays] The arrays to inspect.
8378 * @param {Function} [comparator] The comparator invoked per element.
8379 * @returns {Array} Returns the new array of combined values.
8382 * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
8383 * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
8385 * _.unionWith(objects, others, _.isEqual);
8386 * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
8388 var unionWith = baseRest(function(arrays) {
8389 var comparator = last(arrays);
8390 comparator = typeof comparator == 'function' ? comparator : undefined;
8391 return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);
8395 * Creates a duplicate-free version of an array, using
8396 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
8397 * for equality comparisons, in which only the first occurrence of each element
8398 * is kept. The order of result values is determined by the order they occur
8405 * @param {Array} array The array to inspect.
8406 * @returns {Array} Returns the new duplicate free array.
8409 * _.uniq([2, 1, 2]);
8412 function uniq(array) {
8413 return (array && array.length) ? baseUniq(array) : [];
8417 * This method is like `_.uniq` except that it accepts `iteratee` which is
8418 * invoked for each element in `array` to generate the criterion by which
8419 * uniqueness is computed. The order of result values is determined by the
8420 * order they occur in the array. The iteratee is invoked with one argument:
8427 * @param {Array} array The array to inspect.
8428 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
8429 * @returns {Array} Returns the new duplicate free array.
8432 * _.uniqBy([2.1, 1.2, 2.3], Math.floor);
8435 * // The `_.property` iteratee shorthand.
8436 * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
8437 * // => [{ 'x': 1 }, { 'x': 2 }]
8439 function uniqBy(array, iteratee) {
8440 return (array && array.length) ? baseUniq(array, getIteratee(iteratee, 2)) : [];
8444 * This method is like `_.uniq` except that it accepts `comparator` which
8445 * is invoked to compare elements of `array`. The order of result values is
8446 * determined by the order they occur in the array.The comparator is invoked
8447 * with two arguments: (arrVal, othVal).
8453 * @param {Array} array The array to inspect.
8454 * @param {Function} [comparator] The comparator invoked per element.
8455 * @returns {Array} Returns the new duplicate free array.
8458 * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 2 }];
8460 * _.uniqWith(objects, _.isEqual);
8461 * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]
8463 function uniqWith(array, comparator) {
8464 comparator = typeof comparator == 'function' ? comparator : undefined;
8465 return (array && array.length) ? baseUniq(array, undefined, comparator) : [];
8469 * This method is like `_.zip` except that it accepts an array of grouped
8470 * elements and creates an array regrouping the elements to their pre-zip
8477 * @param {Array} array The array of grouped elements to process.
8478 * @returns {Array} Returns the new array of regrouped elements.
8481 * var zipped = _.zip(['a', 'b'], [1, 2], [true, false]);
8482 * // => [['a', 1, true], ['b', 2, false]]
8485 * // => [['a', 'b'], [1, 2], [true, false]]
8487 function unzip(array) {
8488 if (!(array && array.length)) {
8492 array = arrayFilter(array, function(group) {
8493 if (isArrayLikeObject(group)) {
8494 length = nativeMax(group.length, length);
8498 return baseTimes(length, function(index) {
8499 return arrayMap(array, baseProperty(index));
8504 * This method is like `_.unzip` except that it accepts `iteratee` to specify
8505 * how regrouped values should be combined. The iteratee is invoked with the
8506 * elements of each group: (...group).
8512 * @param {Array} array The array of grouped elements to process.
8513 * @param {Function} [iteratee=_.identity] The function to combine
8515 * @returns {Array} Returns the new array of regrouped elements.
8518 * var zipped = _.zip([1, 2], [10, 20], [100, 200]);
8519 * // => [[1, 10, 100], [2, 20, 200]]
8521 * _.unzipWith(zipped, _.add);
8522 * // => [3, 30, 300]
8524 function unzipWith(array, iteratee) {
8525 if (!(array && array.length)) {
8528 var result = unzip(array);
8529 if (iteratee == null) {
8532 return arrayMap(result, function(group) {
8533 return apply(iteratee, undefined, group);
8538 * Creates an array excluding all given values using
8539 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
8540 * for equality comparisons.
8542 * **Note:** Unlike `_.pull`, this method returns a new array.
8548 * @param {Array} array The array to inspect.
8549 * @param {...*} [values] The values to exclude.
8550 * @returns {Array} Returns the new array of filtered values.
8551 * @see _.difference, _.xor
8554 * _.without([2, 1, 2, 3], 1, 2);
8557 var without = baseRest(function(array, values) {
8558 return isArrayLikeObject(array)
8559 ? baseDifference(array, values)
8564 * Creates an array of unique values that is the
8565 * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)
8566 * of the given arrays. The order of result values is determined by the order
8567 * they occur in the arrays.
8573 * @param {...Array} [arrays] The arrays to inspect.
8574 * @returns {Array} Returns the new array of filtered values.
8575 * @see _.difference, _.without
8578 * _.xor([2, 1], [2, 3]);
8581 var xor = baseRest(function(arrays) {
8582 return baseXor(arrayFilter(arrays, isArrayLikeObject));
8586 * This method is like `_.xor` except that it accepts `iteratee` which is
8587 * invoked for each element of each `arrays` to generate the criterion by
8588 * which by which they're compared. The order of result values is determined
8589 * by the order they occur in the arrays. The iteratee is invoked with one
8590 * argument: (value).
8596 * @param {...Array} [arrays] The arrays to inspect.
8597 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
8598 * @returns {Array} Returns the new array of filtered values.
8601 * _.xorBy([2.1, 1.2], [2.3, 3.4], Math.floor);
8604 * // The `_.property` iteratee shorthand.
8605 * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');
8606 * // => [{ 'x': 2 }]
8608 var xorBy = baseRest(function(arrays) {
8609 var iteratee = last(arrays);
8610 if (isArrayLikeObject(iteratee)) {
8611 iteratee = undefined;
8613 return baseXor(arrayFilter(arrays, isArrayLikeObject), getIteratee(iteratee, 2));
8617 * This method is like `_.xor` except that it accepts `comparator` which is
8618 * invoked to compare elements of `arrays`. The order of result values is
8619 * determined by the order they occur in the arrays. The comparator is invoked
8620 * with two arguments: (arrVal, othVal).
8626 * @param {...Array} [arrays] The arrays to inspect.
8627 * @param {Function} [comparator] The comparator invoked per element.
8628 * @returns {Array} Returns the new array of filtered values.
8631 * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];
8632 * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];
8634 * _.xorWith(objects, others, _.isEqual);
8635 * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]
8637 var xorWith = baseRest(function(arrays) {
8638 var comparator = last(arrays);
8639 comparator = typeof comparator == 'function' ? comparator : undefined;
8640 return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);
8644 * Creates an array of grouped elements, the first of which contains the
8645 * first elements of the given arrays, the second of which contains the
8646 * second elements of the given arrays, and so on.
8652 * @param {...Array} [arrays] The arrays to process.
8653 * @returns {Array} Returns the new array of grouped elements.
8656 * _.zip(['a', 'b'], [1, 2], [true, false]);
8657 * // => [['a', 1, true], ['b', 2, false]]
8659 var zip = baseRest(unzip);
8662 * This method is like `_.fromPairs` except that it accepts two arrays,
8663 * one of property identifiers and one of corresponding values.
8669 * @param {Array} [props=[]] The property identifiers.
8670 * @param {Array} [values=[]] The property values.
8671 * @returns {Object} Returns the new object.
8674 * _.zipObject(['a', 'b'], [1, 2]);
8675 * // => { 'a': 1, 'b': 2 }
8677 function zipObject(props, values) {
8678 return baseZipObject(props || [], values || [], assignValue);
8682 * This method is like `_.zipObject` except that it supports property paths.
8688 * @param {Array} [props=[]] The property identifiers.
8689 * @param {Array} [values=[]] The property values.
8690 * @returns {Object} Returns the new object.
8693 * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);
8694 * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }
8696 function zipObjectDeep(props, values) {
8697 return baseZipObject(props || [], values || [], baseSet);
8701 * This method is like `_.zip` except that it accepts `iteratee` to specify
8702 * how grouped values should be combined. The iteratee is invoked with the
8703 * elements of each group: (...group).
8709 * @param {...Array} [arrays] The arrays to process.
8710 * @param {Function} [iteratee=_.identity] The function to combine
8712 * @returns {Array} Returns the new array of grouped elements.
8715 * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {
8720 var zipWith = baseRest(function(arrays) {
8721 var length = arrays.length,
8722 iteratee = length > 1 ? arrays[length - 1] : undefined;
8724 iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;
8725 return unzipWith(arrays, iteratee);
8728 /*------------------------------------------------------------------------*/
8731 * Creates a `lodash` wrapper instance that wraps `value` with explicit method
8732 * chain sequences enabled. The result of such sequences must be unwrapped
8739 * @param {*} value The value to wrap.
8740 * @returns {Object} Returns the new `lodash` wrapper instance.
8744 * { 'user': 'barney', 'age': 36 },
8745 * { 'user': 'fred', 'age': 40 },
8746 * { 'user': 'pebbles', 'age': 1 }
8752 * .map(function(o) {
8753 * return o.user + ' is ' + o.age;
8757 * // => 'pebbles is 1'
8759 function chain(value) {
8760 var result = lodash(value);
8761 result.__chain__ = true;
8766 * This method invokes `interceptor` and returns `value`. The interceptor
8767 * is invoked with one argument; (value). The purpose of this method is to
8768 * "tap into" a method chain sequence in order to modify intermediate results.
8774 * @param {*} value The value to provide to `interceptor`.
8775 * @param {Function} interceptor The function to invoke.
8776 * @returns {*} Returns `value`.
8780 * .tap(function(array) {
8781 * // Mutate input array.
8788 function tap(value, interceptor) {
8794 * This method is like `_.tap` except that it returns the result of `interceptor`.
8795 * The purpose of this method is to "pass thru" values replacing intermediate
8796 * results in a method chain sequence.
8802 * @param {*} value The value to provide to `interceptor`.
8803 * @param {Function} interceptor The function to invoke.
8804 * @returns {*} Returns the result of `interceptor`.
8810 * .thru(function(value) {
8816 function thru(value, interceptor) {
8817 return interceptor(value);
8821 * This method is the wrapper version of `_.at`.
8827 * @param {...(string|string[])} [paths] The property paths to pick.
8828 * @returns {Object} Returns the new `lodash` wrapper instance.
8831 * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
8833 * _(object).at(['a[0].b.c', 'a[1]']).value();
8836 var wrapperAt = flatRest(function(paths) {
8837 var length = paths.length,
8838 start = length ? paths[0] : 0,
8839 value = this.__wrapped__,
8840 interceptor = function(object) { return baseAt(object, paths); };
8842 if (length > 1 || this.__actions__.length ||
8843 !(value instanceof LazyWrapper) || !isIndex(start)) {
8844 return this.thru(interceptor);
8846 value = value.slice(start, +start + (length ? 1 : 0));
8847 value.__actions__.push({
8849 'args': [interceptor],
8850 'thisArg': undefined
8852 return new LodashWrapper(value, this.__chain__).thru(function(array) {
8853 if (length && !array.length) {
8854 array.push(undefined);
8861 * Creates a `lodash` wrapper instance with explicit method chain sequences enabled.
8867 * @returns {Object} Returns the new `lodash` wrapper instance.
8871 * { 'user': 'barney', 'age': 36 },
8872 * { 'user': 'fred', 'age': 40 }
8875 * // A sequence without explicit chaining.
8877 * // => { 'user': 'barney', 'age': 36 }
8879 * // A sequence with explicit chaining.
8885 * // => { 'user': 'barney' }
8887 function wrapperChain() {
8892 * Executes the chain sequence and returns the wrapped result.
8898 * @returns {Object} Returns the new `lodash` wrapper instance.
8901 * var array = [1, 2];
8902 * var wrapped = _(array).push(3);
8904 * console.log(array);
8907 * wrapped = wrapped.commit();
8908 * console.log(array);
8914 * console.log(array);
8917 function wrapperCommit() {
8918 return new LodashWrapper(this.value(), this.__chain__);
8922 * Gets the next value on a wrapped object following the
8923 * [iterator protocol](https://mdn.io/iteration_protocols#iterator).
8929 * @returns {Object} Returns the next iterator value.
8932 * var wrapped = _([1, 2]);
8935 * // => { 'done': false, 'value': 1 }
8938 * // => { 'done': false, 'value': 2 }
8941 * // => { 'done': true, 'value': undefined }
8943 function wrapperNext() {
8944 if (this.__values__ === undefined) {
8945 this.__values__ = toArray(this.value());
8947 var done = this.__index__ >= this.__values__.length,
8948 value = done ? undefined : this.__values__[this.__index__++];
8950 return { 'done': done, 'value': value };
8954 * Enables the wrapper to be iterable.
8956 * @name Symbol.iterator
8960 * @returns {Object} Returns the wrapper object.
8963 * var wrapped = _([1, 2]);
8965 * wrapped[Symbol.iterator]() === wrapped;
8968 * Array.from(wrapped);
8971 function wrapperToIterator() {
8976 * Creates a clone of the chain sequence planting `value` as the wrapped value.
8982 * @param {*} value The value to plant.
8983 * @returns {Object} Returns the new `lodash` wrapper instance.
8986 * function square(n) {
8990 * var wrapped = _([1, 2]).map(square);
8991 * var other = wrapped.plant([3, 4]);
8999 function wrapperPlant(value) {
9003 while (parent instanceof baseLodash) {
9004 var clone = wrapperClone(parent);
9005 clone.__index__ = 0;
9006 clone.__values__ = undefined;
9008 previous.__wrapped__ = clone;
9012 var previous = clone;
9013 parent = parent.__wrapped__;
9015 previous.__wrapped__ = value;
9020 * This method is the wrapper version of `_.reverse`.
9022 * **Note:** This method mutates the wrapped array.
9028 * @returns {Object} Returns the new `lodash` wrapper instance.
9031 * var array = [1, 2, 3];
9033 * _(array).reverse().value()
9036 * console.log(array);
9039 function wrapperReverse() {
9040 var value = this.__wrapped__;
9041 if (value instanceof LazyWrapper) {
9042 var wrapped = value;
9043 if (this.__actions__.length) {
9044 wrapped = new LazyWrapper(this);
9046 wrapped = wrapped.reverse();
9047 wrapped.__actions__.push({
9050 'thisArg': undefined
9052 return new LodashWrapper(wrapped, this.__chain__);
9054 return this.thru(reverse);
9058 * Executes the chain sequence to resolve the unwrapped value.
9063 * @alias toJSON, valueOf
9065 * @returns {*} Returns the resolved unwrapped value.
9068 * _([1, 2, 3]).value();
9071 function wrapperValue() {
9072 return baseWrapperValue(this.__wrapped__, this.__actions__);
9075 /*------------------------------------------------------------------------*/
9078 * Creates an object composed of keys generated from the results of running
9079 * each element of `collection` thru `iteratee`. The corresponding value of
9080 * each key is the number of times the key was returned by `iteratee`. The
9081 * iteratee is invoked with one argument: (value).
9086 * @category Collection
9087 * @param {Array|Object} collection The collection to iterate over.
9088 * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
9089 * @returns {Object} Returns the composed aggregate object.
9092 * _.countBy([6.1, 4.2, 6.3], Math.floor);
9093 * // => { '4': 1, '6': 2 }
9095 * // The `_.property` iteratee shorthand.
9096 * _.countBy(['one', 'two', 'three'], 'length');
9097 * // => { '3': 2, '5': 1 }
9099 var countBy = createAggregator(function(result, value, key) {
9100 if (hasOwnProperty.call(result, key)) {
9103 baseAssignValue(result, key, 1);
9108 * Checks if `predicate` returns truthy for **all** elements of `collection`.
9109 * Iteration is stopped once `predicate` returns falsey. The predicate is
9110 * invoked with three arguments: (value, index|key, collection).
9112 * **Note:** This method returns `true` for
9113 * [empty collections](https://en.wikipedia.org/wiki/Empty_set) because
9114 * [everything is true](https://en.wikipedia.org/wiki/Vacuous_truth) of
9115 * elements of empty collections.
9120 * @category Collection
9121 * @param {Array|Object} collection The collection to iterate over.
9122 * @param {Function} [predicate=_.identity] The function invoked per iteration.
9123 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
9124 * @returns {boolean} Returns `true` if all elements pass the predicate check,
9128 * _.every([true, 1, null, 'yes'], Boolean);
9132 * { 'user': 'barney', 'age': 36, 'active': false },
9133 * { 'user': 'fred', 'age': 40, 'active': false }
9136 * // The `_.matches` iteratee shorthand.
9137 * _.every(users, { 'user': 'barney', 'active': false });
9140 * // The `_.matchesProperty` iteratee shorthand.
9141 * _.every(users, ['active', false]);
9144 * // The `_.property` iteratee shorthand.
9145 * _.every(users, 'active');
9148 function every(collection, predicate, guard) {
9149 var func = isArray(collection) ? arrayEvery : baseEvery;
9150 if (guard && isIterateeCall(collection, predicate, guard)) {
9151 predicate = undefined;
9153 return func(collection, getIteratee(predicate, 3));
9157 * Iterates over elements of `collection`, returning an array of all elements
9158 * `predicate` returns truthy for. The predicate is invoked with three
9159 * arguments: (value, index|key, collection).
9161 * **Note:** Unlike `_.remove`, this method returns a new array.
9166 * @category Collection
9167 * @param {Array|Object} collection The collection to iterate over.
9168 * @param {Function} [predicate=_.identity] The function invoked per iteration.
9169 * @returns {Array} Returns the new filtered array.
9174 * { 'user': 'barney', 'age': 36, 'active': true },
9175 * { 'user': 'fred', 'age': 40, 'active': false }
9178 * _.filter(users, function(o) { return !o.active; });
9179 * // => objects for ['fred']
9181 * // The `_.matches` iteratee shorthand.
9182 * _.filter(users, { 'age': 36, 'active': true });
9183 * // => objects for ['barney']
9185 * // The `_.matchesProperty` iteratee shorthand.
9186 * _.filter(users, ['active', false]);
9187 * // => objects for ['fred']
9189 * // The `_.property` iteratee shorthand.
9190 * _.filter(users, 'active');
9191 * // => objects for ['barney']
9193 * // Combining several predicates using `_.overEvery` or `_.overSome`.
9194 * _.filter(users, _.overSome([{ 'age': 36 }, ['age', 40]]));
9195 * // => objects for ['fred', 'barney']
9197 function filter(collection, predicate) {
9198 var func = isArray(collection) ? arrayFilter : baseFilter;
9199 return func(collection, getIteratee(predicate, 3));
9203 * Iterates over elements of `collection`, returning the first element
9204 * `predicate` returns truthy for. The predicate is invoked with three
9205 * arguments: (value, index|key, collection).
9210 * @category Collection
9211 * @param {Array|Object} collection The collection to inspect.
9212 * @param {Function} [predicate=_.identity] The function invoked per iteration.
9213 * @param {number} [fromIndex=0] The index to search from.
9214 * @returns {*} Returns the matched element, else `undefined`.
9218 * { 'user': 'barney', 'age': 36, 'active': true },
9219 * { 'user': 'fred', 'age': 40, 'active': false },
9220 * { 'user': 'pebbles', 'age': 1, 'active': true }
9223 * _.find(users, function(o) { return o.age < 40; });
9224 * // => object for 'barney'
9226 * // The `_.matches` iteratee shorthand.
9227 * _.find(users, { 'age': 1, 'active': true });
9228 * // => object for 'pebbles'
9230 * // The `_.matchesProperty` iteratee shorthand.
9231 * _.find(users, ['active', false]);
9232 * // => object for 'fred'
9234 * // The `_.property` iteratee shorthand.
9235 * _.find(users, 'active');
9236 * // => object for 'barney'
9238 var find = createFind(findIndex);
9241 * This method is like `_.find` except that it iterates over elements of
9242 * `collection` from right to left.
9247 * @category Collection
9248 * @param {Array|Object} collection The collection to inspect.
9249 * @param {Function} [predicate=_.identity] The function invoked per iteration.
9250 * @param {number} [fromIndex=collection.length-1] The index to search from.
9251 * @returns {*} Returns the matched element, else `undefined`.
9254 * _.findLast([1, 2, 3, 4], function(n) {
9255 * return n % 2 == 1;
9259 var findLast = createFind(findLastIndex);
9262 * Creates a flattened array of values by running each element in `collection`
9263 * thru `iteratee` and flattening the mapped results. The iteratee is invoked
9264 * with three arguments: (value, index|key, collection).
9269 * @category Collection
9270 * @param {Array|Object} collection The collection to iterate over.
9271 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9272 * @returns {Array} Returns the new flattened array.
9275 * function duplicate(n) {
9279 * _.flatMap([1, 2], duplicate);
9280 * // => [1, 1, 2, 2]
9282 function flatMap(collection, iteratee) {
9283 return baseFlatten(map(collection, iteratee), 1);
9287 * This method is like `_.flatMap` except that it recursively flattens the
9293 * @category Collection
9294 * @param {Array|Object} collection The collection to iterate over.
9295 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9296 * @returns {Array} Returns the new flattened array.
9299 * function duplicate(n) {
9300 * return [[[n, n]]];
9303 * _.flatMapDeep([1, 2], duplicate);
9304 * // => [1, 1, 2, 2]
9306 function flatMapDeep(collection, iteratee) {
9307 return baseFlatten(map(collection, iteratee), INFINITY);
9311 * This method is like `_.flatMap` except that it recursively flattens the
9312 * mapped results up to `depth` times.
9317 * @category Collection
9318 * @param {Array|Object} collection The collection to iterate over.
9319 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9320 * @param {number} [depth=1] The maximum recursion depth.
9321 * @returns {Array} Returns the new flattened array.
9324 * function duplicate(n) {
9325 * return [[[n, n]]];
9328 * _.flatMapDepth([1, 2], duplicate, 2);
9329 * // => [[1, 1], [2, 2]]
9331 function flatMapDepth(collection, iteratee, depth) {
9332 depth = depth === undefined ? 1 : toInteger(depth);
9333 return baseFlatten(map(collection, iteratee), depth);
9337 * Iterates over elements of `collection` and invokes `iteratee` for each element.
9338 * The iteratee is invoked with three arguments: (value, index|key, collection).
9339 * Iteratee functions may exit iteration early by explicitly returning `false`.
9341 * **Note:** As with other "Collections" methods, objects with a "length"
9342 * property are iterated like arrays. To avoid this behavior use `_.forIn`
9343 * or `_.forOwn` for object iteration.
9349 * @category Collection
9350 * @param {Array|Object} collection The collection to iterate over.
9351 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9352 * @returns {Array|Object} Returns `collection`.
9353 * @see _.forEachRight
9356 * _.forEach([1, 2], function(value) {
9357 * console.log(value);
9359 * // => Logs `1` then `2`.
9361 * _.forEach({ 'a': 1, 'b': 2 }, function(value, key) {
9364 * // => Logs 'a' then 'b' (iteration order is not guaranteed).
9366 function forEach(collection, iteratee) {
9367 var func = isArray(collection) ? arrayEach : baseEach;
9368 return func(collection, getIteratee(iteratee, 3));
9372 * This method is like `_.forEach` except that it iterates over elements of
9373 * `collection` from right to left.
9379 * @category Collection
9380 * @param {Array|Object} collection The collection to iterate over.
9381 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9382 * @returns {Array|Object} Returns `collection`.
9386 * _.forEachRight([1, 2], function(value) {
9387 * console.log(value);
9389 * // => Logs `2` then `1`.
9391 function forEachRight(collection, iteratee) {
9392 var func = isArray(collection) ? arrayEachRight : baseEachRight;
9393 return func(collection, getIteratee(iteratee, 3));
9397 * Creates an object composed of keys generated from the results of running
9398 * each element of `collection` thru `iteratee`. The order of grouped values
9399 * is determined by the order they occur in `collection`. The corresponding
9400 * value of each key is an array of elements responsible for generating the
9401 * key. The iteratee is invoked with one argument: (value).
9406 * @category Collection
9407 * @param {Array|Object} collection The collection to iterate over.
9408 * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
9409 * @returns {Object} Returns the composed aggregate object.
9412 * _.groupBy([6.1, 4.2, 6.3], Math.floor);
9413 * // => { '4': [4.2], '6': [6.1, 6.3] }
9415 * // The `_.property` iteratee shorthand.
9416 * _.groupBy(['one', 'two', 'three'], 'length');
9417 * // => { '3': ['one', 'two'], '5': ['three'] }
9419 var groupBy = createAggregator(function(result, value, key) {
9420 if (hasOwnProperty.call(result, key)) {
9421 result[key].push(value);
9423 baseAssignValue(result, key, [value]);
9428 * Checks if `value` is in `collection`. If `collection` is a string, it's
9429 * checked for a substring of `value`, otherwise
9430 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
9431 * is used for equality comparisons. If `fromIndex` is negative, it's used as
9432 * the offset from the end of `collection`.
9437 * @category Collection
9438 * @param {Array|Object|string} collection The collection to inspect.
9439 * @param {*} value The value to search for.
9440 * @param {number} [fromIndex=0] The index to search from.
9441 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
9442 * @returns {boolean} Returns `true` if `value` is found, else `false`.
9445 * _.includes([1, 2, 3], 1);
9448 * _.includes([1, 2, 3], 1, 2);
9451 * _.includes({ 'a': 1, 'b': 2 }, 1);
9454 * _.includes('abcd', 'bc');
9457 function includes(collection, value, fromIndex, guard) {
9458 collection = isArrayLike(collection) ? collection : values(collection);
9459 fromIndex = (fromIndex && !guard) ? toInteger(fromIndex) : 0;
9461 var length = collection.length;
9462 if (fromIndex < 0) {
9463 fromIndex = nativeMax(length + fromIndex, 0);
9465 return isString(collection)
9466 ? (fromIndex <= length && collection.indexOf(value, fromIndex) > -1)
9467 : (!!length && baseIndexOf(collection, value, fromIndex) > -1);
9471 * Invokes the method at `path` of each element in `collection`, returning
9472 * an array of the results of each invoked method. Any additional arguments
9473 * are provided to each invoked method. If `path` is a function, it's invoked
9474 * for, and `this` bound to, each element in `collection`.
9479 * @category Collection
9480 * @param {Array|Object} collection The collection to iterate over.
9481 * @param {Array|Function|string} path The path of the method to invoke or
9482 * the function invoked per iteration.
9483 * @param {...*} [args] The arguments to invoke each method with.
9484 * @returns {Array} Returns the array of results.
9487 * _.invokeMap([[5, 1, 7], [3, 2, 1]], 'sort');
9488 * // => [[1, 5, 7], [1, 2, 3]]
9490 * _.invokeMap([123, 456], String.prototype.split, '');
9491 * // => [['1', '2', '3'], ['4', '5', '6']]
9493 var invokeMap = baseRest(function(collection, path, args) {
9495 isFunc = typeof path == 'function',
9496 result = isArrayLike(collection) ? Array(collection.length) : [];
9498 baseEach(collection, function(value) {
9499 result[++index] = isFunc ? apply(path, value, args) : baseInvoke(value, path, args);
9505 * Creates an object composed of keys generated from the results of running
9506 * each element of `collection` thru `iteratee`. The corresponding value of
9507 * each key is the last element responsible for generating the key. The
9508 * iteratee is invoked with one argument: (value).
9513 * @category Collection
9514 * @param {Array|Object} collection The collection to iterate over.
9515 * @param {Function} [iteratee=_.identity] The iteratee to transform keys.
9516 * @returns {Object} Returns the composed aggregate object.
9520 * { 'dir': 'left', 'code': 97 },
9521 * { 'dir': 'right', 'code': 100 }
9524 * _.keyBy(array, function(o) {
9525 * return String.fromCharCode(o.code);
9527 * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } }
9529 * _.keyBy(array, 'dir');
9530 * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } }
9532 var keyBy = createAggregator(function(result, value, key) {
9533 baseAssignValue(result, key, value);
9537 * Creates an array of values by running each element in `collection` thru
9538 * `iteratee`. The iteratee is invoked with three arguments:
9539 * (value, index|key, collection).
9541 * Many lodash methods are guarded to work as iteratees for methods like
9542 * `_.every`, `_.filter`, `_.map`, `_.mapValues`, `_.reject`, and `_.some`.
9544 * The guarded methods are:
9545 * `ary`, `chunk`, `curry`, `curryRight`, `drop`, `dropRight`, `every`,
9546 * `fill`, `invert`, `parseInt`, `random`, `range`, `rangeRight`, `repeat`,
9547 * `sampleSize`, `slice`, `some`, `sortBy`, `split`, `take`, `takeRight`,
9548 * `template`, `trim`, `trimEnd`, `trimStart`, and `words`
9553 * @category Collection
9554 * @param {Array|Object} collection The collection to iterate over.
9555 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9556 * @returns {Array} Returns the new mapped array.
9559 * function square(n) {
9563 * _.map([4, 8], square);
9566 * _.map({ 'a': 4, 'b': 8 }, square);
9567 * // => [16, 64] (iteration order is not guaranteed)
9570 * { 'user': 'barney' },
9571 * { 'user': 'fred' }
9574 * // The `_.property` iteratee shorthand.
9575 * _.map(users, 'user');
9576 * // => ['barney', 'fred']
9578 function map(collection, iteratee) {
9579 var func = isArray(collection) ? arrayMap : baseMap;
9580 return func(collection, getIteratee(iteratee, 3));
9584 * This method is like `_.sortBy` except that it allows specifying the sort
9585 * orders of the iteratees to sort by. If `orders` is unspecified, all values
9586 * are sorted in ascending order. Otherwise, specify an order of "desc" for
9587 * descending or "asc" for ascending sort order of corresponding values.
9592 * @category Collection
9593 * @param {Array|Object} collection The collection to iterate over.
9594 * @param {Array[]|Function[]|Object[]|string[]} [iteratees=[_.identity]]
9595 * The iteratees to sort by.
9596 * @param {string[]} [orders] The sort orders of `iteratees`.
9597 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.reduce`.
9598 * @returns {Array} Returns the new sorted array.
9602 * { 'user': 'fred', 'age': 48 },
9603 * { 'user': 'barney', 'age': 34 },
9604 * { 'user': 'fred', 'age': 40 },
9605 * { 'user': 'barney', 'age': 36 }
9608 * // Sort by `user` in ascending order and by `age` in descending order.
9609 * _.orderBy(users, ['user', 'age'], ['asc', 'desc']);
9610 * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 40]]
9612 function orderBy(collection, iteratees, orders, guard) {
9613 if (collection == null) {
9616 if (!isArray(iteratees)) {
9617 iteratees = iteratees == null ? [] : [iteratees];
9619 orders = guard ? undefined : orders;
9620 if (!isArray(orders)) {
9621 orders = orders == null ? [] : [orders];
9623 return baseOrderBy(collection, iteratees, orders);
9627 * Creates an array of elements split into two groups, the first of which
9628 * contains elements `predicate` returns truthy for, the second of which
9629 * contains elements `predicate` returns falsey for. The predicate is
9630 * invoked with one argument: (value).
9635 * @category Collection
9636 * @param {Array|Object} collection The collection to iterate over.
9637 * @param {Function} [predicate=_.identity] The function invoked per iteration.
9638 * @returns {Array} Returns the array of grouped elements.
9642 * { 'user': 'barney', 'age': 36, 'active': false },
9643 * { 'user': 'fred', 'age': 40, 'active': true },
9644 * { 'user': 'pebbles', 'age': 1, 'active': false }
9647 * _.partition(users, function(o) { return o.active; });
9648 * // => objects for [['fred'], ['barney', 'pebbles']]
9650 * // The `_.matches` iteratee shorthand.
9651 * _.partition(users, { 'age': 1, 'active': false });
9652 * // => objects for [['pebbles'], ['barney', 'fred']]
9654 * // The `_.matchesProperty` iteratee shorthand.
9655 * _.partition(users, ['active', false]);
9656 * // => objects for [['barney', 'pebbles'], ['fred']]
9658 * // The `_.property` iteratee shorthand.
9659 * _.partition(users, 'active');
9660 * // => objects for [['fred'], ['barney', 'pebbles']]
9662 var partition = createAggregator(function(result, value, key) {
9663 result[key ? 0 : 1].push(value);
9664 }, function() { return [[], []]; });
9667 * Reduces `collection` to a value which is the accumulated result of running
9668 * each element in `collection` thru `iteratee`, where each successive
9669 * invocation is supplied the return value of the previous. If `accumulator`
9670 * is not given, the first element of `collection` is used as the initial
9671 * value. The iteratee is invoked with four arguments:
9672 * (accumulator, value, index|key, collection).
9674 * Many lodash methods are guarded to work as iteratees for methods like
9675 * `_.reduce`, `_.reduceRight`, and `_.transform`.
9677 * The guarded methods are:
9678 * `assign`, `defaults`, `defaultsDeep`, `includes`, `merge`, `orderBy`,
9684 * @category Collection
9685 * @param {Array|Object} collection The collection to iterate over.
9686 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9687 * @param {*} [accumulator] The initial value.
9688 * @returns {*} Returns the accumulated value.
9689 * @see _.reduceRight
9692 * _.reduce([1, 2], function(sum, n) {
9697 * _.reduce({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
9698 * (result[value] || (result[value] = [])).push(key);
9701 * // => { '1': ['a', 'c'], '2': ['b'] } (iteration order is not guaranteed)
9703 function reduce(collection, iteratee, accumulator) {
9704 var func = isArray(collection) ? arrayReduce : baseReduce,
9705 initAccum = arguments.length < 3;
9707 return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEach);
9711 * This method is like `_.reduce` except that it iterates over elements of
9712 * `collection` from right to left.
9717 * @category Collection
9718 * @param {Array|Object} collection The collection to iterate over.
9719 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
9720 * @param {*} [accumulator] The initial value.
9721 * @returns {*} Returns the accumulated value.
9725 * var array = [[0, 1], [2, 3], [4, 5]];
9727 * _.reduceRight(array, function(flattened, other) {
9728 * return flattened.concat(other);
9730 * // => [4, 5, 2, 3, 0, 1]
9732 function reduceRight(collection, iteratee, accumulator) {
9733 var func = isArray(collection) ? arrayReduceRight : baseReduce,
9734 initAccum = arguments.length < 3;
9736 return func(collection, getIteratee(iteratee, 4), accumulator, initAccum, baseEachRight);
9740 * The opposite of `_.filter`; this method returns the elements of `collection`
9741 * that `predicate` does **not** return truthy for.
9746 * @category Collection
9747 * @param {Array|Object} collection The collection to iterate over.
9748 * @param {Function} [predicate=_.identity] The function invoked per iteration.
9749 * @returns {Array} Returns the new filtered array.
9754 * { 'user': 'barney', 'age': 36, 'active': false },
9755 * { 'user': 'fred', 'age': 40, 'active': true }
9758 * _.reject(users, function(o) { return !o.active; });
9759 * // => objects for ['fred']
9761 * // The `_.matches` iteratee shorthand.
9762 * _.reject(users, { 'age': 40, 'active': true });
9763 * // => objects for ['barney']
9765 * // The `_.matchesProperty` iteratee shorthand.
9766 * _.reject(users, ['active', false]);
9767 * // => objects for ['fred']
9769 * // The `_.property` iteratee shorthand.
9770 * _.reject(users, 'active');
9771 * // => objects for ['barney']
9773 function reject(collection, predicate) {
9774 var func = isArray(collection) ? arrayFilter : baseFilter;
9775 return func(collection, negate(getIteratee(predicate, 3)));
9779 * Gets a random element from `collection`.
9784 * @category Collection
9785 * @param {Array|Object} collection The collection to sample.
9786 * @returns {*} Returns the random element.
9789 * _.sample([1, 2, 3, 4]);
9792 function sample(collection) {
9793 var func = isArray(collection) ? arraySample : baseSample;
9794 return func(collection);
9798 * Gets `n` random elements at unique keys from `collection` up to the
9799 * size of `collection`.
9804 * @category Collection
9805 * @param {Array|Object} collection The collection to sample.
9806 * @param {number} [n=1] The number of elements to sample.
9807 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
9808 * @returns {Array} Returns the random elements.
9811 * _.sampleSize([1, 2, 3], 2);
9814 * _.sampleSize([1, 2, 3], 4);
9817 function sampleSize(collection, n, guard) {
9818 if ((guard ? isIterateeCall(collection, n, guard) : n === undefined)) {
9823 var func = isArray(collection) ? arraySampleSize : baseSampleSize;
9824 return func(collection, n);
9828 * Creates an array of shuffled values, using a version of the
9829 * [Fisher-Yates shuffle](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle).
9834 * @category Collection
9835 * @param {Array|Object} collection The collection to shuffle.
9836 * @returns {Array} Returns the new shuffled array.
9839 * _.shuffle([1, 2, 3, 4]);
9840 * // => [4, 1, 3, 2]
9842 function shuffle(collection) {
9843 var func = isArray(collection) ? arrayShuffle : baseShuffle;
9844 return func(collection);
9848 * Gets the size of `collection` by returning its length for array-like
9849 * values or the number of own enumerable string keyed properties for objects.
9854 * @category Collection
9855 * @param {Array|Object|string} collection The collection to inspect.
9856 * @returns {number} Returns the collection size.
9859 * _.size([1, 2, 3]);
9862 * _.size({ 'a': 1, 'b': 2 });
9865 * _.size('pebbles');
9868 function size(collection) {
9869 if (collection == null) {
9872 if (isArrayLike(collection)) {
9873 return isString(collection) ? stringSize(collection) : collection.length;
9875 var tag = getTag(collection);
9876 if (tag == mapTag || tag == setTag) {
9877 return collection.size;
9879 return baseKeys(collection).length;
9883 * Checks if `predicate` returns truthy for **any** element of `collection`.
9884 * Iteration is stopped once `predicate` returns truthy. The predicate is
9885 * invoked with three arguments: (value, index|key, collection).
9890 * @category Collection
9891 * @param {Array|Object} collection The collection to iterate over.
9892 * @param {Function} [predicate=_.identity] The function invoked per iteration.
9893 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
9894 * @returns {boolean} Returns `true` if any element passes the predicate check,
9898 * _.some([null, 0, 'yes', false], Boolean);
9902 * { 'user': 'barney', 'active': true },
9903 * { 'user': 'fred', 'active': false }
9906 * // The `_.matches` iteratee shorthand.
9907 * _.some(users, { 'user': 'barney', 'active': false });
9910 * // The `_.matchesProperty` iteratee shorthand.
9911 * _.some(users, ['active', false]);
9914 * // The `_.property` iteratee shorthand.
9915 * _.some(users, 'active');
9918 function some(collection, predicate, guard) {
9919 var func = isArray(collection) ? arraySome : baseSome;
9920 if (guard && isIterateeCall(collection, predicate, guard)) {
9921 predicate = undefined;
9923 return func(collection, getIteratee(predicate, 3));
9927 * Creates an array of elements, sorted in ascending order by the results of
9928 * running each element in a collection thru each iteratee. This method
9929 * performs a stable sort, that is, it preserves the original sort order of
9930 * equal elements. The iteratees are invoked with one argument: (value).
9935 * @category Collection
9936 * @param {Array|Object} collection The collection to iterate over.
9937 * @param {...(Function|Function[])} [iteratees=[_.identity]]
9938 * The iteratees to sort by.
9939 * @returns {Array} Returns the new sorted array.
9943 * { 'user': 'fred', 'age': 48 },
9944 * { 'user': 'barney', 'age': 36 },
9945 * { 'user': 'fred', 'age': 30 },
9946 * { 'user': 'barney', 'age': 34 }
9949 * _.sortBy(users, [function(o) { return o.user; }]);
9950 * // => objects for [['barney', 36], ['barney', 34], ['fred', 48], ['fred', 30]]
9952 * _.sortBy(users, ['user', 'age']);
9953 * // => objects for [['barney', 34], ['barney', 36], ['fred', 30], ['fred', 48]]
9955 var sortBy = baseRest(function(collection, iteratees) {
9956 if (collection == null) {
9959 var length = iteratees.length;
9960 if (length > 1 && isIterateeCall(collection, iteratees[0], iteratees[1])) {
9962 } else if (length > 2 && isIterateeCall(iteratees[0], iteratees[1], iteratees[2])) {
9963 iteratees = [iteratees[0]];
9965 return baseOrderBy(collection, baseFlatten(iteratees, 1), []);
9968 /*------------------------------------------------------------------------*/
9971 * Gets the timestamp of the number of milliseconds that have elapsed since
9972 * the Unix epoch (1 January 1970 00:00:00 UTC).
9978 * @returns {number} Returns the timestamp.
9981 * _.defer(function(stamp) {
9982 * console.log(_.now() - stamp);
9984 * // => Logs the number of milliseconds it took for the deferred invocation.
9986 var now = ctxNow || function() {
9987 return root.Date.now();
9990 /*------------------------------------------------------------------------*/
9993 * The opposite of `_.before`; this method creates a function that invokes
9994 * `func` once it's called `n` or more times.
9999 * @category Function
10000 * @param {number} n The number of calls before `func` is invoked.
10001 * @param {Function} func The function to restrict.
10002 * @returns {Function} Returns the new restricted function.
10005 * var saves = ['profile', 'settings'];
10007 * var done = _.after(saves.length, function() {
10008 * console.log('done saving!');
10011 * _.forEach(saves, function(type) {
10012 * asyncSave({ 'type': type, 'complete': done });
10014 * // => Logs 'done saving!' after the two async saves have completed.
10016 function after(n, func) {
10017 if (typeof func != 'function') {
10018 throw new TypeError(FUNC_ERROR_TEXT);
10021 return function() {
10023 return func.apply(this, arguments);
10029 * Creates a function that invokes `func`, with up to `n` arguments,
10030 * ignoring any additional arguments.
10035 * @category Function
10036 * @param {Function} func The function to cap arguments for.
10037 * @param {number} [n=func.length] The arity cap.
10038 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
10039 * @returns {Function} Returns the new capped function.
10042 * _.map(['6', '8', '10'], _.ary(parseInt, 1));
10045 function ary(func, n, guard) {
10046 n = guard ? undefined : n;
10047 n = (func && n == null) ? func.length : n;
10048 return createWrap(func, WRAP_ARY_FLAG, undefined, undefined, undefined, undefined, n);
10052 * Creates a function that invokes `func`, with the `this` binding and arguments
10053 * of the created function, while it's called less than `n` times. Subsequent
10054 * calls to the created function return the result of the last `func` invocation.
10059 * @category Function
10060 * @param {number} n The number of calls at which `func` is no longer invoked.
10061 * @param {Function} func The function to restrict.
10062 * @returns {Function} Returns the new restricted function.
10065 * jQuery(element).on('click', _.before(5, addContactToList));
10066 * // => Allows adding up to 4 contacts to the list.
10068 function before(n, func) {
10070 if (typeof func != 'function') {
10071 throw new TypeError(FUNC_ERROR_TEXT);
10074 return function() {
10076 result = func.apply(this, arguments);
10086 * Creates a function that invokes `func` with the `this` binding of `thisArg`
10087 * and `partials` prepended to the arguments it receives.
10089 * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
10090 * may be used as a placeholder for partially applied arguments.
10092 * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
10093 * property of bound functions.
10098 * @category Function
10099 * @param {Function} func The function to bind.
10100 * @param {*} thisArg The `this` binding of `func`.
10101 * @param {...*} [partials] The arguments to be partially applied.
10102 * @returns {Function} Returns the new bound function.
10105 * function greet(greeting, punctuation) {
10106 * return greeting + ' ' + this.user + punctuation;
10109 * var object = { 'user': 'fred' };
10111 * var bound = _.bind(greet, object, 'hi');
10115 * // Bound with placeholders.
10116 * var bound = _.bind(greet, object, _, '!');
10120 var bind = baseRest(function(func, thisArg, partials) {
10121 var bitmask = WRAP_BIND_FLAG;
10122 if (partials.length) {
10123 var holders = replaceHolders(partials, getHolder(bind));
10124 bitmask |= WRAP_PARTIAL_FLAG;
10126 return createWrap(func, bitmask, thisArg, partials, holders);
10130 * Creates a function that invokes the method at `object[key]` with `partials`
10131 * prepended to the arguments it receives.
10133 * This method differs from `_.bind` by allowing bound functions to reference
10134 * methods that may be redefined or don't yet exist. See
10135 * [Peter Michaux's article](http://peter.michaux.ca/articles/lazy-function-definition-pattern)
10136 * for more details.
10138 * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic
10139 * builds, may be used as a placeholder for partially applied arguments.
10144 * @category Function
10145 * @param {Object} object The object to invoke the method on.
10146 * @param {string} key The key of the method.
10147 * @param {...*} [partials] The arguments to be partially applied.
10148 * @returns {Function} Returns the new bound function.
10153 * 'greet': function(greeting, punctuation) {
10154 * return greeting + ' ' + this.user + punctuation;
10158 * var bound = _.bindKey(object, 'greet', 'hi');
10162 * object.greet = function(greeting, punctuation) {
10163 * return greeting + 'ya ' + this.user + punctuation;
10167 * // => 'hiya fred!'
10169 * // Bound with placeholders.
10170 * var bound = _.bindKey(object, 'greet', _, '!');
10172 * // => 'hiya fred!'
10174 var bindKey = baseRest(function(object, key, partials) {
10175 var bitmask = WRAP_BIND_FLAG | WRAP_BIND_KEY_FLAG;
10176 if (partials.length) {
10177 var holders = replaceHolders(partials, getHolder(bindKey));
10178 bitmask |= WRAP_PARTIAL_FLAG;
10180 return createWrap(key, bitmask, object, partials, holders);
10184 * Creates a function that accepts arguments of `func` and either invokes
10185 * `func` returning its result, if at least `arity` number of arguments have
10186 * been provided, or returns a function that accepts the remaining `func`
10187 * arguments, and so on. The arity of `func` may be specified if `func.length`
10188 * is not sufficient.
10190 * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
10191 * may be used as a placeholder for provided arguments.
10193 * **Note:** This method doesn't set the "length" property of curried functions.
10198 * @category Function
10199 * @param {Function} func The function to curry.
10200 * @param {number} [arity=func.length] The arity of `func`.
10201 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
10202 * @returns {Function} Returns the new curried function.
10205 * var abc = function(a, b, c) {
10206 * return [a, b, c];
10209 * var curried = _.curry(abc);
10211 * curried(1)(2)(3);
10214 * curried(1, 2)(3);
10217 * curried(1, 2, 3);
10220 * // Curried with placeholders.
10221 * curried(1)(_, 3)(2);
10224 function curry(func, arity, guard) {
10225 arity = guard ? undefined : arity;
10226 var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
10227 result.placeholder = curry.placeholder;
10232 * This method is like `_.curry` except that arguments are applied to `func`
10233 * in the manner of `_.partialRight` instead of `_.partial`.
10235 * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic
10236 * builds, may be used as a placeholder for provided arguments.
10238 * **Note:** This method doesn't set the "length" property of curried functions.
10243 * @category Function
10244 * @param {Function} func The function to curry.
10245 * @param {number} [arity=func.length] The arity of `func`.
10246 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
10247 * @returns {Function} Returns the new curried function.
10250 * var abc = function(a, b, c) {
10251 * return [a, b, c];
10254 * var curried = _.curryRight(abc);
10256 * curried(3)(2)(1);
10259 * curried(2, 3)(1);
10262 * curried(1, 2, 3);
10265 * // Curried with placeholders.
10266 * curried(3)(1, _)(2);
10269 function curryRight(func, arity, guard) {
10270 arity = guard ? undefined : arity;
10271 var result = createWrap(func, WRAP_CURRY_RIGHT_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
10272 result.placeholder = curryRight.placeholder;
10277 * Creates a debounced function that delays invoking `func` until after `wait`
10278 * milliseconds have elapsed since the last time the debounced function was
10279 * invoked. The debounced function comes with a `cancel` method to cancel
10280 * delayed `func` invocations and a `flush` method to immediately invoke them.
10281 * Provide `options` to indicate whether `func` should be invoked on the
10282 * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
10283 * with the last arguments provided to the debounced function. Subsequent
10284 * calls to the debounced function return the result of the last `func`
10287 * **Note:** If `leading` and `trailing` options are `true`, `func` is
10288 * invoked on the trailing edge of the timeout only if the debounced function
10289 * is invoked more than once during the `wait` timeout.
10291 * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
10292 * until to the next tick, similar to `setTimeout` with a timeout of `0`.
10294 * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
10295 * for details over the differences between `_.debounce` and `_.throttle`.
10300 * @category Function
10301 * @param {Function} func The function to debounce.
10302 * @param {number} [wait=0] The number of milliseconds to delay.
10303 * @param {Object} [options={}] The options object.
10304 * @param {boolean} [options.leading=false]
10305 * Specify invoking on the leading edge of the timeout.
10306 * @param {number} [options.maxWait]
10307 * The maximum time `func` is allowed to be delayed before it's invoked.
10308 * @param {boolean} [options.trailing=true]
10309 * Specify invoking on the trailing edge of the timeout.
10310 * @returns {Function} Returns the new debounced function.
10313 * // Avoid costly calculations while the window size is in flux.
10314 * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
10316 * // Invoke `sendMail` when clicked, debouncing subsequent calls.
10317 * jQuery(element).on('click', _.debounce(sendMail, 300, {
10319 * 'trailing': false
10322 * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
10323 * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
10324 * var source = new EventSource('/stream');
10325 * jQuery(source).on('message', debounced);
10327 * // Cancel the trailing debounced invocation.
10328 * jQuery(window).on('popstate', debounced.cancel);
10330 function debounce(func, wait, options) {
10337 lastInvokeTime = 0,
10342 if (typeof func != 'function') {
10343 throw new TypeError(FUNC_ERROR_TEXT);
10345 wait = toNumber(wait) || 0;
10346 if (isObject(options)) {
10347 leading = !!options.leading;
10348 maxing = 'maxWait' in options;
10349 maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
10350 trailing = 'trailing' in options ? !!options.trailing : trailing;
10353 function invokeFunc(time) {
10354 var args = lastArgs,
10355 thisArg = lastThis;
10357 lastArgs = lastThis = undefined;
10358 lastInvokeTime = time;
10359 result = func.apply(thisArg, args);
10363 function leadingEdge(time) {
10364 // Reset any `maxWait` timer.
10365 lastInvokeTime = time;
10366 // Start the timer for the trailing edge.
10367 timerId = setTimeout(timerExpired, wait);
10368 // Invoke the leading edge.
10369 return leading ? invokeFunc(time) : result;
10372 function remainingWait(time) {
10373 var timeSinceLastCall = time - lastCallTime,
10374 timeSinceLastInvoke = time - lastInvokeTime,
10375 timeWaiting = wait - timeSinceLastCall;
10378 ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
10382 function shouldInvoke(time) {
10383 var timeSinceLastCall = time - lastCallTime,
10384 timeSinceLastInvoke = time - lastInvokeTime;
10386 // Either this is the first call, activity has stopped and we're at the
10387 // trailing edge, the system time has gone backwards and we're treating
10388 // it as the trailing edge, or we've hit the `maxWait` limit.
10389 return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
10390 (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
10393 function timerExpired() {
10395 if (shouldInvoke(time)) {
10396 return trailingEdge(time);
10398 // Restart the timer.
10399 timerId = setTimeout(timerExpired, remainingWait(time));
10402 function trailingEdge(time) {
10403 timerId = undefined;
10405 // Only invoke if we have `lastArgs` which means `func` has been
10406 // debounced at least once.
10407 if (trailing && lastArgs) {
10408 return invokeFunc(time);
10410 lastArgs = lastThis = undefined;
10414 function cancel() {
10415 if (timerId !== undefined) {
10416 clearTimeout(timerId);
10418 lastInvokeTime = 0;
10419 lastArgs = lastCallTime = lastThis = timerId = undefined;
10423 return timerId === undefined ? result : trailingEdge(now());
10426 function debounced() {
10428 isInvoking = shouldInvoke(time);
10430 lastArgs = arguments;
10432 lastCallTime = time;
10435 if (timerId === undefined) {
10436 return leadingEdge(lastCallTime);
10439 // Handle invocations in a tight loop.
10440 clearTimeout(timerId);
10441 timerId = setTimeout(timerExpired, wait);
10442 return invokeFunc(lastCallTime);
10445 if (timerId === undefined) {
10446 timerId = setTimeout(timerExpired, wait);
10450 debounced.cancel = cancel;
10451 debounced.flush = flush;
10456 * Defers invoking the `func` until the current call stack has cleared. Any
10457 * additional arguments are provided to `func` when it's invoked.
10462 * @category Function
10463 * @param {Function} func The function to defer.
10464 * @param {...*} [args] The arguments to invoke `func` with.
10465 * @returns {number} Returns the timer id.
10468 * _.defer(function(text) {
10469 * console.log(text);
10471 * // => Logs 'deferred' after one millisecond.
10473 var defer = baseRest(function(func, args) {
10474 return baseDelay(func, 1, args);
10478 * Invokes `func` after `wait` milliseconds. Any additional arguments are
10479 * provided to `func` when it's invoked.
10484 * @category Function
10485 * @param {Function} func The function to delay.
10486 * @param {number} wait The number of milliseconds to delay invocation.
10487 * @param {...*} [args] The arguments to invoke `func` with.
10488 * @returns {number} Returns the timer id.
10491 * _.delay(function(text) {
10492 * console.log(text);
10493 * }, 1000, 'later');
10494 * // => Logs 'later' after one second.
10496 var delay = baseRest(function(func, wait, args) {
10497 return baseDelay(func, toNumber(wait) || 0, args);
10501 * Creates a function that invokes `func` with arguments reversed.
10506 * @category Function
10507 * @param {Function} func The function to flip arguments for.
10508 * @returns {Function} Returns the new flipped function.
10511 * var flipped = _.flip(function() {
10512 * return _.toArray(arguments);
10515 * flipped('a', 'b', 'c', 'd');
10516 * // => ['d', 'c', 'b', 'a']
10518 function flip(func) {
10519 return createWrap(func, WRAP_FLIP_FLAG);
10523 * Creates a function that memoizes the result of `func`. If `resolver` is
10524 * provided, it determines the cache key for storing the result based on the
10525 * arguments provided to the memoized function. By default, the first argument
10526 * provided to the memoized function is used as the map cache key. The `func`
10527 * is invoked with the `this` binding of the memoized function.
10529 * **Note:** The cache is exposed as the `cache` property on the memoized
10530 * function. Its creation may be customized by replacing the `_.memoize.Cache`
10531 * constructor with one whose instances implement the
10532 * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)
10533 * method interface of `clear`, `delete`, `get`, `has`, and `set`.
10538 * @category Function
10539 * @param {Function} func The function to have its output memoized.
10540 * @param {Function} [resolver] The function to resolve the cache key.
10541 * @returns {Function} Returns the new memoized function.
10544 * var object = { 'a': 1, 'b': 2 };
10545 * var other = { 'c': 3, 'd': 4 };
10547 * var values = _.memoize(_.values);
10558 * // Modify the result cache.
10559 * values.cache.set(object, ['a', 'b']);
10563 * // Replace `_.memoize.Cache`.
10564 * _.memoize.Cache = WeakMap;
10566 function memoize(func, resolver) {
10567 if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {
10568 throw new TypeError(FUNC_ERROR_TEXT);
10570 var memoized = function() {
10571 var args = arguments,
10572 key = resolver ? resolver.apply(this, args) : args[0],
10573 cache = memoized.cache;
10575 if (cache.has(key)) {
10576 return cache.get(key);
10578 var result = func.apply(this, args);
10579 memoized.cache = cache.set(key, result) || cache;
10582 memoized.cache = new (memoize.Cache || MapCache);
10586 // Expose `MapCache`.
10587 memoize.Cache = MapCache;
10590 * Creates a function that negates the result of the predicate `func`. The
10591 * `func` predicate is invoked with the `this` binding and arguments of the
10592 * created function.
10597 * @category Function
10598 * @param {Function} predicate The predicate to negate.
10599 * @returns {Function} Returns the new negated function.
10602 * function isEven(n) {
10603 * return n % 2 == 0;
10606 * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven));
10609 function negate(predicate) {
10610 if (typeof predicate != 'function') {
10611 throw new TypeError(FUNC_ERROR_TEXT);
10613 return function() {
10614 var args = arguments;
10615 switch (args.length) {
10616 case 0: return !predicate.call(this);
10617 case 1: return !predicate.call(this, args[0]);
10618 case 2: return !predicate.call(this, args[0], args[1]);
10619 case 3: return !predicate.call(this, args[0], args[1], args[2]);
10621 return !predicate.apply(this, args);
10626 * Creates a function that is restricted to invoking `func` once. Repeat calls
10627 * to the function return the value of the first invocation. The `func` is
10628 * invoked with the `this` binding and arguments of the created function.
10633 * @category Function
10634 * @param {Function} func The function to restrict.
10635 * @returns {Function} Returns the new restricted function.
10638 * var initialize = _.once(createApplication);
10641 * // => `createApplication` is invoked once
10643 function once(func) {
10644 return before(2, func);
10648 * Creates a function that invokes `func` with its arguments transformed.
10653 * @category Function
10654 * @param {Function} func The function to wrap.
10655 * @param {...(Function|Function[])} [transforms=[_.identity]]
10656 * The argument transforms.
10657 * @returns {Function} Returns the new function.
10660 * function doubled(n) {
10664 * function square(n) {
10668 * var func = _.overArgs(function(x, y) {
10670 * }, [square, doubled]);
10678 var overArgs = castRest(function(func, transforms) {
10679 transforms = (transforms.length == 1 && isArray(transforms[0]))
10680 ? arrayMap(transforms[0], baseUnary(getIteratee()))
10681 : arrayMap(baseFlatten(transforms, 1), baseUnary(getIteratee()));
10683 var funcsLength = transforms.length;
10684 return baseRest(function(args) {
10686 length = nativeMin(args.length, funcsLength);
10688 while (++index < length) {
10689 args[index] = transforms[index].call(this, args[index]);
10691 return apply(func, this, args);
10696 * Creates a function that invokes `func` with `partials` prepended to the
10697 * arguments it receives. This method is like `_.bind` except it does **not**
10698 * alter the `this` binding.
10700 * The `_.partial.placeholder` value, which defaults to `_` in monolithic
10701 * builds, may be used as a placeholder for partially applied arguments.
10703 * **Note:** This method doesn't set the "length" property of partially
10704 * applied functions.
10709 * @category Function
10710 * @param {Function} func The function to partially apply arguments to.
10711 * @param {...*} [partials] The arguments to be partially applied.
10712 * @returns {Function} Returns the new partially applied function.
10715 * function greet(greeting, name) {
10716 * return greeting + ' ' + name;
10719 * var sayHelloTo = _.partial(greet, 'hello');
10720 * sayHelloTo('fred');
10721 * // => 'hello fred'
10723 * // Partially applied with placeholders.
10724 * var greetFred = _.partial(greet, _, 'fred');
10728 var partial = baseRest(function(func, partials) {
10729 var holders = replaceHolders(partials, getHolder(partial));
10730 return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
10734 * This method is like `_.partial` except that partially applied arguments
10735 * are appended to the arguments it receives.
10737 * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic
10738 * builds, may be used as a placeholder for partially applied arguments.
10740 * **Note:** This method doesn't set the "length" property of partially
10741 * applied functions.
10746 * @category Function
10747 * @param {Function} func The function to partially apply arguments to.
10748 * @param {...*} [partials] The arguments to be partially applied.
10749 * @returns {Function} Returns the new partially applied function.
10752 * function greet(greeting, name) {
10753 * return greeting + ' ' + name;
10756 * var greetFred = _.partialRight(greet, 'fred');
10760 * // Partially applied with placeholders.
10761 * var sayHelloTo = _.partialRight(greet, 'hello', _);
10762 * sayHelloTo('fred');
10763 * // => 'hello fred'
10765 var partialRight = baseRest(function(func, partials) {
10766 var holders = replaceHolders(partials, getHolder(partialRight));
10767 return createWrap(func, WRAP_PARTIAL_RIGHT_FLAG, undefined, partials, holders);
10771 * Creates a function that invokes `func` with arguments arranged according
10772 * to the specified `indexes` where the argument value at the first index is
10773 * provided as the first argument, the argument value at the second index is
10774 * provided as the second argument, and so on.
10779 * @category Function
10780 * @param {Function} func The function to rearrange arguments for.
10781 * @param {...(number|number[])} indexes The arranged argument indexes.
10782 * @returns {Function} Returns the new function.
10785 * var rearged = _.rearg(function(a, b, c) {
10786 * return [a, b, c];
10789 * rearged('b', 'c', 'a')
10790 * // => ['a', 'b', 'c']
10792 var rearg = flatRest(function(func, indexes) {
10793 return createWrap(func, WRAP_REARG_FLAG, undefined, undefined, undefined, indexes);
10797 * Creates a function that invokes `func` with the `this` binding of the
10798 * created function and arguments from `start` and beyond provided as
10801 * **Note:** This method is based on the
10802 * [rest parameter](https://mdn.io/rest_parameters).
10807 * @category Function
10808 * @param {Function} func The function to apply a rest parameter to.
10809 * @param {number} [start=func.length-1] The start position of the rest parameter.
10810 * @returns {Function} Returns the new function.
10813 * var say = _.rest(function(what, names) {
10814 * return what + ' ' + _.initial(names).join(', ') +
10815 * (_.size(names) > 1 ? ', & ' : '') + _.last(names);
10818 * say('hello', 'fred', 'barney', 'pebbles');
10819 * // => 'hello fred, barney, & pebbles'
10821 function rest(func, start) {
10822 if (typeof func != 'function') {
10823 throw new TypeError(FUNC_ERROR_TEXT);
10825 start = start === undefined ? start : toInteger(start);
10826 return baseRest(func, start);
10830 * Creates a function that invokes `func` with the `this` binding of the
10831 * create function and an array of arguments much like
10832 * [`Function#apply`](http://www.ecma-international.org/ecma-262/7.0/#sec-function.prototype.apply).
10834 * **Note:** This method is based on the
10835 * [spread operator](https://mdn.io/spread_operator).
10840 * @category Function
10841 * @param {Function} func The function to spread arguments over.
10842 * @param {number} [start=0] The start position of the spread.
10843 * @returns {Function} Returns the new function.
10846 * var say = _.spread(function(who, what) {
10847 * return who + ' says ' + what;
10850 * say(['fred', 'hello']);
10851 * // => 'fred says hello'
10853 * var numbers = Promise.all([
10854 * Promise.resolve(40),
10855 * Promise.resolve(36)
10858 * numbers.then(_.spread(function(x, y) {
10861 * // => a Promise of 76
10863 function spread(func, start) {
10864 if (typeof func != 'function') {
10865 throw new TypeError(FUNC_ERROR_TEXT);
10867 start = start == null ? 0 : nativeMax(toInteger(start), 0);
10868 return baseRest(function(args) {
10869 var array = args[start],
10870 otherArgs = castSlice(args, 0, start);
10873 arrayPush(otherArgs, array);
10875 return apply(func, this, otherArgs);
10880 * Creates a throttled function that only invokes `func` at most once per
10881 * every `wait` milliseconds. The throttled function comes with a `cancel`
10882 * method to cancel delayed `func` invocations and a `flush` method to
10883 * immediately invoke them. Provide `options` to indicate whether `func`
10884 * should be invoked on the leading and/or trailing edge of the `wait`
10885 * timeout. The `func` is invoked with the last arguments provided to the
10886 * throttled function. Subsequent calls to the throttled function return the
10887 * result of the last `func` invocation.
10889 * **Note:** If `leading` and `trailing` options are `true`, `func` is
10890 * invoked on the trailing edge of the timeout only if the throttled function
10891 * is invoked more than once during the `wait` timeout.
10893 * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
10894 * until to the next tick, similar to `setTimeout` with a timeout of `0`.
10896 * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
10897 * for details over the differences between `_.throttle` and `_.debounce`.
10902 * @category Function
10903 * @param {Function} func The function to throttle.
10904 * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
10905 * @param {Object} [options={}] The options object.
10906 * @param {boolean} [options.leading=true]
10907 * Specify invoking on the leading edge of the timeout.
10908 * @param {boolean} [options.trailing=true]
10909 * Specify invoking on the trailing edge of the timeout.
10910 * @returns {Function} Returns the new throttled function.
10913 * // Avoid excessively updating the position while scrolling.
10914 * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
10916 * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
10917 * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
10918 * jQuery(element).on('click', throttled);
10920 * // Cancel the trailing throttled invocation.
10921 * jQuery(window).on('popstate', throttled.cancel);
10923 function throttle(func, wait, options) {
10924 var leading = true,
10927 if (typeof func != 'function') {
10928 throw new TypeError(FUNC_ERROR_TEXT);
10930 if (isObject(options)) {
10931 leading = 'leading' in options ? !!options.leading : leading;
10932 trailing = 'trailing' in options ? !!options.trailing : trailing;
10934 return debounce(func, wait, {
10935 'leading': leading,
10937 'trailing': trailing
10942 * Creates a function that accepts up to one argument, ignoring any
10943 * additional arguments.
10948 * @category Function
10949 * @param {Function} func The function to cap arguments for.
10950 * @returns {Function} Returns the new capped function.
10953 * _.map(['6', '8', '10'], _.unary(parseInt));
10956 function unary(func) {
10957 return ary(func, 1);
10961 * Creates a function that provides `value` to `wrapper` as its first
10962 * argument. Any additional arguments provided to the function are appended
10963 * to those provided to the `wrapper`. The wrapper is invoked with the `this`
10964 * binding of the created function.
10969 * @category Function
10970 * @param {*} value The value to wrap.
10971 * @param {Function} [wrapper=identity] The wrapper function.
10972 * @returns {Function} Returns the new function.
10975 * var p = _.wrap(_.escape, function(func, text) {
10976 * return '<p>' + func(text) + '</p>';
10979 * p('fred, barney, & pebbles');
10980 * // => '<p>fred, barney, & pebbles</p>'
10982 function wrap(value, wrapper) {
10983 return partial(castFunction(wrapper), value);
10986 /*------------------------------------------------------------------------*/
10989 * Casts `value` as an array if it's not one.
10995 * @param {*} value The value to inspect.
10996 * @returns {Array} Returns the cast array.
11002 * _.castArray({ 'a': 1 });
11003 * // => [{ 'a': 1 }]
11005 * _.castArray('abc');
11008 * _.castArray(null);
11011 * _.castArray(undefined);
11012 * // => [undefined]
11017 * var array = [1, 2, 3];
11018 * console.log(_.castArray(array) === array);
11021 function castArray() {
11022 if (!arguments.length) {
11025 var value = arguments[0];
11026 return isArray(value) ? value : [value];
11030 * Creates a shallow clone of `value`.
11032 * **Note:** This method is loosely based on the
11033 * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)
11034 * and supports cloning arrays, array buffers, booleans, date objects, maps,
11035 * numbers, `Object` objects, regexes, sets, strings, symbols, and typed
11036 * arrays. The own enumerable properties of `arguments` objects are cloned
11037 * as plain objects. An empty object is returned for uncloneable values such
11038 * as error objects, functions, DOM nodes, and WeakMaps.
11044 * @param {*} value The value to clone.
11045 * @returns {*} Returns the cloned value.
11049 * var objects = [{ 'a': 1 }, { 'b': 2 }];
11051 * var shallow = _.clone(objects);
11052 * console.log(shallow[0] === objects[0]);
11055 function clone(value) {
11056 return baseClone(value, CLONE_SYMBOLS_FLAG);
11060 * This method is like `_.clone` except that it accepts `customizer` which
11061 * is invoked to produce the cloned value. If `customizer` returns `undefined`,
11062 * cloning is handled by the method instead. The `customizer` is invoked with
11063 * up to four arguments; (value [, index|key, object, stack]).
11069 * @param {*} value The value to clone.
11070 * @param {Function} [customizer] The function to customize cloning.
11071 * @returns {*} Returns the cloned value.
11072 * @see _.cloneDeepWith
11075 * function customizer(value) {
11076 * if (_.isElement(value)) {
11077 * return value.cloneNode(false);
11081 * var el = _.cloneWith(document.body, customizer);
11083 * console.log(el === document.body);
11085 * console.log(el.nodeName);
11087 * console.log(el.childNodes.length);
11090 function cloneWith(value, customizer) {
11091 customizer = typeof customizer == 'function' ? customizer : undefined;
11092 return baseClone(value, CLONE_SYMBOLS_FLAG, customizer);
11096 * This method is like `_.clone` except that it recursively clones `value`.
11102 * @param {*} value The value to recursively clone.
11103 * @returns {*} Returns the deep cloned value.
11107 * var objects = [{ 'a': 1 }, { 'b': 2 }];
11109 * var deep = _.cloneDeep(objects);
11110 * console.log(deep[0] === objects[0]);
11113 function cloneDeep(value) {
11114 return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);
11118 * This method is like `_.cloneWith` except that it recursively clones `value`.
11124 * @param {*} value The value to recursively clone.
11125 * @param {Function} [customizer] The function to customize cloning.
11126 * @returns {*} Returns the deep cloned value.
11130 * function customizer(value) {
11131 * if (_.isElement(value)) {
11132 * return value.cloneNode(true);
11136 * var el = _.cloneDeepWith(document.body, customizer);
11138 * console.log(el === document.body);
11140 * console.log(el.nodeName);
11142 * console.log(el.childNodes.length);
11145 function cloneDeepWith(value, customizer) {
11146 customizer = typeof customizer == 'function' ? customizer : undefined;
11147 return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);
11151 * Checks if `object` conforms to `source` by invoking the predicate
11152 * properties of `source` with the corresponding property values of `object`.
11154 * **Note:** This method is equivalent to `_.conforms` when `source` is
11155 * partially applied.
11161 * @param {Object} object The object to inspect.
11162 * @param {Object} source The object of property predicates to conform to.
11163 * @returns {boolean} Returns `true` if `object` conforms, else `false`.
11166 * var object = { 'a': 1, 'b': 2 };
11168 * _.conformsTo(object, { 'b': function(n) { return n > 1; } });
11171 * _.conformsTo(object, { 'b': function(n) { return n > 2; } });
11174 function conformsTo(object, source) {
11175 return source == null || baseConformsTo(object, source, keys(source));
11180 * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)
11181 * comparison between two values to determine if they are equivalent.
11187 * @param {*} value The value to compare.
11188 * @param {*} other The other value to compare.
11189 * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
11192 * var object = { 'a': 1 };
11193 * var other = { 'a': 1 };
11195 * _.eq(object, object);
11198 * _.eq(object, other);
11204 * _.eq('a', Object('a'));
11210 function eq(value, other) {
11211 return value === other || (value !== value && other !== other);
11215 * Checks if `value` is greater than `other`.
11221 * @param {*} value The value to compare.
11222 * @param {*} other The other value to compare.
11223 * @returns {boolean} Returns `true` if `value` is greater than `other`,
11237 var gt = createRelationalOperation(baseGt);
11240 * Checks if `value` is greater than or equal to `other`.
11246 * @param {*} value The value to compare.
11247 * @param {*} other The other value to compare.
11248 * @returns {boolean} Returns `true` if `value` is greater than or equal to
11249 * `other`, else `false`.
11262 var gte = createRelationalOperation(function(value, other) {
11263 return value >= other;
11267 * Checks if `value` is likely an `arguments` object.
11273 * @param {*} value The value to check.
11274 * @returns {boolean} Returns `true` if `value` is an `arguments` object,
11278 * _.isArguments(function() { return arguments; }());
11281 * _.isArguments([1, 2, 3]);
11284 var isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {
11285 return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&
11286 !propertyIsEnumerable.call(value, 'callee');
11290 * Checks if `value` is classified as an `Array` object.
11296 * @param {*} value The value to check.
11297 * @returns {boolean} Returns `true` if `value` is an array, else `false`.
11300 * _.isArray([1, 2, 3]);
11303 * _.isArray(document.body.children);
11306 * _.isArray('abc');
11309 * _.isArray(_.noop);
11312 var isArray = Array.isArray;
11315 * Checks if `value` is classified as an `ArrayBuffer` object.
11321 * @param {*} value The value to check.
11322 * @returns {boolean} Returns `true` if `value` is an array buffer, else `false`.
11325 * _.isArrayBuffer(new ArrayBuffer(2));
11328 * _.isArrayBuffer(new Array(2));
11331 var isArrayBuffer = nodeIsArrayBuffer ? baseUnary(nodeIsArrayBuffer) : baseIsArrayBuffer;
11334 * Checks if `value` is array-like. A value is considered array-like if it's
11335 * not a function and has a `value.length` that's an integer greater than or
11336 * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.
11342 * @param {*} value The value to check.
11343 * @returns {boolean} Returns `true` if `value` is array-like, else `false`.
11346 * _.isArrayLike([1, 2, 3]);
11349 * _.isArrayLike(document.body.children);
11352 * _.isArrayLike('abc');
11355 * _.isArrayLike(_.noop);
11358 function isArrayLike(value) {
11359 return value != null && isLength(value.length) && !isFunction(value);
11363 * This method is like `_.isArrayLike` except that it also checks if `value`
11370 * @param {*} value The value to check.
11371 * @returns {boolean} Returns `true` if `value` is an array-like object,
11375 * _.isArrayLikeObject([1, 2, 3]);
11378 * _.isArrayLikeObject(document.body.children);
11381 * _.isArrayLikeObject('abc');
11384 * _.isArrayLikeObject(_.noop);
11387 function isArrayLikeObject(value) {
11388 return isObjectLike(value) && isArrayLike(value);
11392 * Checks if `value` is classified as a boolean primitive or object.
11398 * @param {*} value The value to check.
11399 * @returns {boolean} Returns `true` if `value` is a boolean, else `false`.
11402 * _.isBoolean(false);
11405 * _.isBoolean(null);
11408 function isBoolean(value) {
11409 return value === true || value === false ||
11410 (isObjectLike(value) && baseGetTag(value) == boolTag);
11414 * Checks if `value` is a buffer.
11420 * @param {*} value The value to check.
11421 * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.
11424 * _.isBuffer(new Buffer(2));
11427 * _.isBuffer(new Uint8Array(2));
11430 var isBuffer = nativeIsBuffer || stubFalse;
11433 * Checks if `value` is classified as a `Date` object.
11439 * @param {*} value The value to check.
11440 * @returns {boolean} Returns `true` if `value` is a date object, else `false`.
11443 * _.isDate(new Date);
11446 * _.isDate('Mon April 23 2012');
11449 var isDate = nodeIsDate ? baseUnary(nodeIsDate) : baseIsDate;
11452 * Checks if `value` is likely a DOM element.
11458 * @param {*} value The value to check.
11459 * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.
11462 * _.isElement(document.body);
11465 * _.isElement('<body>');
11468 function isElement(value) {
11469 return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);
11473 * Checks if `value` is an empty object, collection, map, or set.
11475 * Objects are considered empty if they have no own enumerable string keyed
11478 * Array-like values such as `arguments` objects, arrays, buffers, strings, or
11479 * jQuery-like collections are considered empty if they have a `length` of `0`.
11480 * Similarly, maps and sets are considered empty if they have a `size` of `0`.
11486 * @param {*} value The value to check.
11487 * @returns {boolean} Returns `true` if `value` is empty, else `false`.
11499 * _.isEmpty([1, 2, 3]);
11502 * _.isEmpty({ 'a': 1 });
11505 function isEmpty(value) {
11506 if (value == null) {
11509 if (isArrayLike(value) &&
11510 (isArray(value) || typeof value == 'string' || typeof value.splice == 'function' ||
11511 isBuffer(value) || isTypedArray(value) || isArguments(value))) {
11512 return !value.length;
11514 var tag = getTag(value);
11515 if (tag == mapTag || tag == setTag) {
11516 return !value.size;
11518 if (isPrototype(value)) {
11519 return !baseKeys(value).length;
11521 for (var key in value) {
11522 if (hasOwnProperty.call(value, key)) {
11530 * Performs a deep comparison between two values to determine if they are
11533 * **Note:** This method supports comparing arrays, array buffers, booleans,
11534 * date objects, error objects, maps, numbers, `Object` objects, regexes,
11535 * sets, strings, symbols, and typed arrays. `Object` objects are compared
11536 * by their own, not inherited, enumerable properties. Functions and DOM
11537 * nodes are compared by strict equality, i.e. `===`.
11543 * @param {*} value The value to compare.
11544 * @param {*} other The other value to compare.
11545 * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
11548 * var object = { 'a': 1 };
11549 * var other = { 'a': 1 };
11551 * _.isEqual(object, other);
11554 * object === other;
11557 function isEqual(value, other) {
11558 return baseIsEqual(value, other);
11562 * This method is like `_.isEqual` except that it accepts `customizer` which
11563 * is invoked to compare values. If `customizer` returns `undefined`, comparisons
11564 * are handled by the method instead. The `customizer` is invoked with up to
11565 * six arguments: (objValue, othValue [, index|key, object, other, stack]).
11571 * @param {*} value The value to compare.
11572 * @param {*} other The other value to compare.
11573 * @param {Function} [customizer] The function to customize comparisons.
11574 * @returns {boolean} Returns `true` if the values are equivalent, else `false`.
11577 * function isGreeting(value) {
11578 * return /^h(?:i|ello)$/.test(value);
11581 * function customizer(objValue, othValue) {
11582 * if (isGreeting(objValue) && isGreeting(othValue)) {
11587 * var array = ['hello', 'goodbye'];
11588 * var other = ['hi', 'goodbye'];
11590 * _.isEqualWith(array, other, customizer);
11593 function isEqualWith(value, other, customizer) {
11594 customizer = typeof customizer == 'function' ? customizer : undefined;
11595 var result = customizer ? customizer(value, other) : undefined;
11596 return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;
11600 * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`,
11601 * `SyntaxError`, `TypeError`, or `URIError` object.
11607 * @param {*} value The value to check.
11608 * @returns {boolean} Returns `true` if `value` is an error object, else `false`.
11611 * _.isError(new Error);
11614 * _.isError(Error);
11617 function isError(value) {
11618 if (!isObjectLike(value)) {
11621 var tag = baseGetTag(value);
11622 return tag == errorTag || tag == domExcTag ||
11623 (typeof value.message == 'string' && typeof value.name == 'string' && !isPlainObject(value));
11627 * Checks if `value` is a finite primitive number.
11629 * **Note:** This method is based on
11630 * [`Number.isFinite`](https://mdn.io/Number/isFinite).
11636 * @param {*} value The value to check.
11637 * @returns {boolean} Returns `true` if `value` is a finite number, else `false`.
11643 * _.isFinite(Number.MIN_VALUE);
11646 * _.isFinite(Infinity);
11652 function isFinite(value) {
11653 return typeof value == 'number' && nativeIsFinite(value);
11657 * Checks if `value` is classified as a `Function` object.
11663 * @param {*} value The value to check.
11664 * @returns {boolean} Returns `true` if `value` is a function, else `false`.
11670 * _.isFunction(/abc/);
11673 function isFunction(value) {
11674 if (!isObject(value)) {
11677 // The use of `Object#toString` avoids issues with the `typeof` operator
11678 // in Safari 9 which returns 'object' for typed arrays and other constructors.
11679 var tag = baseGetTag(value);
11680 return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;
11684 * Checks if `value` is an integer.
11686 * **Note:** This method is based on
11687 * [`Number.isInteger`](https://mdn.io/Number/isInteger).
11693 * @param {*} value The value to check.
11694 * @returns {boolean} Returns `true` if `value` is an integer, else `false`.
11700 * _.isInteger(Number.MIN_VALUE);
11703 * _.isInteger(Infinity);
11706 * _.isInteger('3');
11709 function isInteger(value) {
11710 return typeof value == 'number' && value == toInteger(value);
11714 * Checks if `value` is a valid array-like length.
11716 * **Note:** This method is loosely based on
11717 * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
11723 * @param {*} value The value to check.
11724 * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.
11730 * _.isLength(Number.MIN_VALUE);
11733 * _.isLength(Infinity);
11739 function isLength(value) {
11740 return typeof value == 'number' &&
11741 value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;
11745 * Checks if `value` is the
11746 * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
11747 * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
11753 * @param {*} value The value to check.
11754 * @returns {boolean} Returns `true` if `value` is an object, else `false`.
11760 * _.isObject([1, 2, 3]);
11763 * _.isObject(_.noop);
11766 * _.isObject(null);
11769 function isObject(value) {
11770 var type = typeof value;
11771 return value != null && (type == 'object' || type == 'function');
11775 * Checks if `value` is object-like. A value is object-like if it's not `null`
11776 * and has a `typeof` result of "object".
11782 * @param {*} value The value to check.
11783 * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
11786 * _.isObjectLike({});
11789 * _.isObjectLike([1, 2, 3]);
11792 * _.isObjectLike(_.noop);
11795 * _.isObjectLike(null);
11798 function isObjectLike(value) {
11799 return value != null && typeof value == 'object';
11803 * Checks if `value` is classified as a `Map` object.
11809 * @param {*} value The value to check.
11810 * @returns {boolean} Returns `true` if `value` is a map, else `false`.
11813 * _.isMap(new Map);
11816 * _.isMap(new WeakMap);
11819 var isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;
11822 * Performs a partial deep comparison between `object` and `source` to
11823 * determine if `object` contains equivalent property values.
11825 * **Note:** This method is equivalent to `_.matches` when `source` is
11826 * partially applied.
11828 * Partial comparisons will match empty array and empty object `source`
11829 * values against any array or object value, respectively. See `_.isEqual`
11830 * for a list of supported value comparisons.
11836 * @param {Object} object The object to inspect.
11837 * @param {Object} source The object of property values to match.
11838 * @returns {boolean} Returns `true` if `object` is a match, else `false`.
11841 * var object = { 'a': 1, 'b': 2 };
11843 * _.isMatch(object, { 'b': 2 });
11846 * _.isMatch(object, { 'b': 1 });
11849 function isMatch(object, source) {
11850 return object === source || baseIsMatch(object, source, getMatchData(source));
11854 * This method is like `_.isMatch` except that it accepts `customizer` which
11855 * is invoked to compare values. If `customizer` returns `undefined`, comparisons
11856 * are handled by the method instead. The `customizer` is invoked with five
11857 * arguments: (objValue, srcValue, index|key, object, source).
11863 * @param {Object} object The object to inspect.
11864 * @param {Object} source The object of property values to match.
11865 * @param {Function} [customizer] The function to customize comparisons.
11866 * @returns {boolean} Returns `true` if `object` is a match, else `false`.
11869 * function isGreeting(value) {
11870 * return /^h(?:i|ello)$/.test(value);
11873 * function customizer(objValue, srcValue) {
11874 * if (isGreeting(objValue) && isGreeting(srcValue)) {
11879 * var object = { 'greeting': 'hello' };
11880 * var source = { 'greeting': 'hi' };
11882 * _.isMatchWith(object, source, customizer);
11885 function isMatchWith(object, source, customizer) {
11886 customizer = typeof customizer == 'function' ? customizer : undefined;
11887 return baseIsMatch(object, source, getMatchData(source), customizer);
11891 * Checks if `value` is `NaN`.
11893 * **Note:** This method is based on
11894 * [`Number.isNaN`](https://mdn.io/Number/isNaN) and is not the same as
11895 * global [`isNaN`](https://mdn.io/isNaN) which returns `true` for
11896 * `undefined` and other non-number values.
11902 * @param {*} value The value to check.
11903 * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`.
11909 * _.isNaN(new Number(NaN));
11912 * isNaN(undefined);
11915 * _.isNaN(undefined);
11918 function isNaN(value) {
11919 // An `NaN` primitive is the only value that is not equal to itself.
11920 // Perform the `toStringTag` check first to avoid errors with some
11921 // ActiveX objects in IE.
11922 return isNumber(value) && value != +value;
11926 * Checks if `value` is a pristine native function.
11928 * **Note:** This method can't reliably detect native functions in the presence
11929 * of the core-js package because core-js circumvents this kind of detection.
11930 * Despite multiple requests, the core-js maintainer has made it clear: any
11931 * attempt to fix the detection will be obstructed. As a result, we're left
11932 * with little choice but to throw an error. Unfortunately, this also affects
11933 * packages, like [babel-polyfill](https://www.npmjs.com/package/babel-polyfill),
11934 * which rely on core-js.
11940 * @param {*} value The value to check.
11941 * @returns {boolean} Returns `true` if `value` is a native function,
11945 * _.isNative(Array.prototype.push);
11951 function isNative(value) {
11952 if (isMaskable(value)) {
11953 throw new Error(CORE_ERROR_TEXT);
11955 return baseIsNative(value);
11959 * Checks if `value` is `null`.
11965 * @param {*} value The value to check.
11966 * @returns {boolean} Returns `true` if `value` is `null`, else `false`.
11972 * _.isNull(void 0);
11975 function isNull(value) {
11976 return value === null;
11980 * Checks if `value` is `null` or `undefined`.
11986 * @param {*} value The value to check.
11987 * @returns {boolean} Returns `true` if `value` is nullish, else `false`.
11999 function isNil(value) {
12000 return value == null;
12004 * Checks if `value` is classified as a `Number` primitive or object.
12006 * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are
12007 * classified as numbers, use the `_.isFinite` method.
12013 * @param {*} value The value to check.
12014 * @returns {boolean} Returns `true` if `value` is a number, else `false`.
12020 * _.isNumber(Number.MIN_VALUE);
12023 * _.isNumber(Infinity);
12029 function isNumber(value) {
12030 return typeof value == 'number' ||
12031 (isObjectLike(value) && baseGetTag(value) == numberTag);
12035 * Checks if `value` is a plain object, that is, an object created by the
12036 * `Object` constructor or one with a `[[Prototype]]` of `null`.
12042 * @param {*} value The value to check.
12043 * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.
12050 * _.isPlainObject(new Foo);
12053 * _.isPlainObject([1, 2, 3]);
12056 * _.isPlainObject({ 'x': 0, 'y': 0 });
12059 * _.isPlainObject(Object.create(null));
12062 function isPlainObject(value) {
12063 if (!isObjectLike(value) || baseGetTag(value) != objectTag) {
12066 var proto = getPrototype(value);
12067 if (proto === null) {
12070 var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;
12071 return typeof Ctor == 'function' && Ctor instanceof Ctor &&
12072 funcToString.call(Ctor) == objectCtorString;
12076 * Checks if `value` is classified as a `RegExp` object.
12082 * @param {*} value The value to check.
12083 * @returns {boolean} Returns `true` if `value` is a regexp, else `false`.
12086 * _.isRegExp(/abc/);
12089 * _.isRegExp('/abc/');
12092 var isRegExp = nodeIsRegExp ? baseUnary(nodeIsRegExp) : baseIsRegExp;
12095 * Checks if `value` is a safe integer. An integer is safe if it's an IEEE-754
12096 * double precision number which isn't the result of a rounded unsafe integer.
12098 * **Note:** This method is based on
12099 * [`Number.isSafeInteger`](https://mdn.io/Number/isSafeInteger).
12105 * @param {*} value The value to check.
12106 * @returns {boolean} Returns `true` if `value` is a safe integer, else `false`.
12109 * _.isSafeInteger(3);
12112 * _.isSafeInteger(Number.MIN_VALUE);
12115 * _.isSafeInteger(Infinity);
12118 * _.isSafeInteger('3');
12121 function isSafeInteger(value) {
12122 return isInteger(value) && value >= -MAX_SAFE_INTEGER && value <= MAX_SAFE_INTEGER;
12126 * Checks if `value` is classified as a `Set` object.
12132 * @param {*} value The value to check.
12133 * @returns {boolean} Returns `true` if `value` is a set, else `false`.
12136 * _.isSet(new Set);
12139 * _.isSet(new WeakSet);
12142 var isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;
12145 * Checks if `value` is classified as a `String` primitive or object.
12151 * @param {*} value The value to check.
12152 * @returns {boolean} Returns `true` if `value` is a string, else `false`.
12155 * _.isString('abc');
12161 function isString(value) {
12162 return typeof value == 'string' ||
12163 (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);
12167 * Checks if `value` is classified as a `Symbol` primitive or object.
12173 * @param {*} value The value to check.
12174 * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
12177 * _.isSymbol(Symbol.iterator);
12180 * _.isSymbol('abc');
12183 function isSymbol(value) {
12184 return typeof value == 'symbol' ||
12185 (isObjectLike(value) && baseGetTag(value) == symbolTag);
12189 * Checks if `value` is classified as a typed array.
12195 * @param {*} value The value to check.
12196 * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.
12199 * _.isTypedArray(new Uint8Array);
12202 * _.isTypedArray([]);
12205 var isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;
12208 * Checks if `value` is `undefined`.
12214 * @param {*} value The value to check.
12215 * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`.
12218 * _.isUndefined(void 0);
12221 * _.isUndefined(null);
12224 function isUndefined(value) {
12225 return value === undefined;
12229 * Checks if `value` is classified as a `WeakMap` object.
12235 * @param {*} value The value to check.
12236 * @returns {boolean} Returns `true` if `value` is a weak map, else `false`.
12239 * _.isWeakMap(new WeakMap);
12242 * _.isWeakMap(new Map);
12245 function isWeakMap(value) {
12246 return isObjectLike(value) && getTag(value) == weakMapTag;
12250 * Checks if `value` is classified as a `WeakSet` object.
12256 * @param {*} value The value to check.
12257 * @returns {boolean} Returns `true` if `value` is a weak set, else `false`.
12260 * _.isWeakSet(new WeakSet);
12263 * _.isWeakSet(new Set);
12266 function isWeakSet(value) {
12267 return isObjectLike(value) && baseGetTag(value) == weakSetTag;
12271 * Checks if `value` is less than `other`.
12277 * @param {*} value The value to compare.
12278 * @param {*} other The other value to compare.
12279 * @returns {boolean} Returns `true` if `value` is less than `other`,
12293 var lt = createRelationalOperation(baseLt);
12296 * Checks if `value` is less than or equal to `other`.
12302 * @param {*} value The value to compare.
12303 * @param {*} other The other value to compare.
12304 * @returns {boolean} Returns `true` if `value` is less than or equal to
12305 * `other`, else `false`.
12318 var lte = createRelationalOperation(function(value, other) {
12319 return value <= other;
12323 * Converts `value` to an array.
12329 * @param {*} value The value to convert.
12330 * @returns {Array} Returns the converted array.
12333 * _.toArray({ 'a': 1, 'b': 2 });
12336 * _.toArray('abc');
12337 * // => ['a', 'b', 'c']
12345 function toArray(value) {
12349 if (isArrayLike(value)) {
12350 return isString(value) ? stringToArray(value) : copyArray(value);
12352 if (symIterator && value[symIterator]) {
12353 return iteratorToArray(value[symIterator]());
12355 var tag = getTag(value),
12356 func = tag == mapTag ? mapToArray : (tag == setTag ? setToArray : values);
12358 return func(value);
12362 * Converts `value` to a finite number.
12368 * @param {*} value The value to convert.
12369 * @returns {number} Returns the converted number.
12375 * _.toFinite(Number.MIN_VALUE);
12378 * _.toFinite(Infinity);
12379 * // => 1.7976931348623157e+308
12381 * _.toFinite('3.2');
12384 function toFinite(value) {
12386 return value === 0 ? value : 0;
12388 value = toNumber(value);
12389 if (value === INFINITY || value === -INFINITY) {
12390 var sign = (value < 0 ? -1 : 1);
12391 return sign * MAX_INTEGER;
12393 return value === value ? value : 0;
12397 * Converts `value` to an integer.
12399 * **Note:** This method is loosely based on
12400 * [`ToInteger`](http://www.ecma-international.org/ecma-262/7.0/#sec-tointeger).
12406 * @param {*} value The value to convert.
12407 * @returns {number} Returns the converted integer.
12410 * _.toInteger(3.2);
12413 * _.toInteger(Number.MIN_VALUE);
12416 * _.toInteger(Infinity);
12417 * // => 1.7976931348623157e+308
12419 * _.toInteger('3.2');
12422 function toInteger(value) {
12423 var result = toFinite(value),
12424 remainder = result % 1;
12426 return result === result ? (remainder ? result - remainder : result) : 0;
12430 * Converts `value` to an integer suitable for use as the length of an
12431 * array-like object.
12433 * **Note:** This method is based on
12434 * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).
12440 * @param {*} value The value to convert.
12441 * @returns {number} Returns the converted integer.
12447 * _.toLength(Number.MIN_VALUE);
12450 * _.toLength(Infinity);
12453 * _.toLength('3.2');
12456 function toLength(value) {
12457 return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;
12461 * Converts `value` to a number.
12467 * @param {*} value The value to process.
12468 * @returns {number} Returns the number.
12474 * _.toNumber(Number.MIN_VALUE);
12477 * _.toNumber(Infinity);
12480 * _.toNumber('3.2');
12483 function toNumber(value) {
12484 if (typeof value == 'number') {
12487 if (isSymbol(value)) {
12490 if (isObject(value)) {
12491 var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
12492 value = isObject(other) ? (other + '') : other;
12494 if (typeof value != 'string') {
12495 return value === 0 ? value : +value;
12497 value = value.replace(reTrim, '');
12498 var isBinary = reIsBinary.test(value);
12499 return (isBinary || reIsOctal.test(value))
12500 ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
12501 : (reIsBadHex.test(value) ? NAN : +value);
12505 * Converts `value` to a plain object flattening inherited enumerable string
12506 * keyed properties of `value` to own properties of the plain object.
12512 * @param {*} value The value to convert.
12513 * @returns {Object} Returns the converted plain object.
12520 * Foo.prototype.c = 3;
12522 * _.assign({ 'a': 1 }, new Foo);
12523 * // => { 'a': 1, 'b': 2 }
12525 * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));
12526 * // => { 'a': 1, 'b': 2, 'c': 3 }
12528 function toPlainObject(value) {
12529 return copyObject(value, keysIn(value));
12533 * Converts `value` to a safe integer. A safe integer can be compared and
12534 * represented correctly.
12540 * @param {*} value The value to convert.
12541 * @returns {number} Returns the converted integer.
12544 * _.toSafeInteger(3.2);
12547 * _.toSafeInteger(Number.MIN_VALUE);
12550 * _.toSafeInteger(Infinity);
12551 * // => 9007199254740991
12553 * _.toSafeInteger('3.2');
12556 function toSafeInteger(value) {
12558 ? baseClamp(toInteger(value), -MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)
12559 : (value === 0 ? value : 0);
12563 * Converts `value` to a string. An empty string is returned for `null`
12564 * and `undefined` values. The sign of `-0` is preserved.
12570 * @param {*} value The value to convert.
12571 * @returns {string} Returns the converted string.
12574 * _.toString(null);
12580 * _.toString([1, 2, 3]);
12583 function toString(value) {
12584 return value == null ? '' : baseToString(value);
12587 /*------------------------------------------------------------------------*/
12590 * Assigns own enumerable string keyed properties of source objects to the
12591 * destination object. Source objects are applied from left to right.
12592 * Subsequent sources overwrite property assignments of previous sources.
12594 * **Note:** This method mutates `object` and is loosely based on
12595 * [`Object.assign`](https://mdn.io/Object/assign).
12601 * @param {Object} object The destination object.
12602 * @param {...Object} [sources] The source objects.
12603 * @returns {Object} Returns `object`.
12615 * Foo.prototype.b = 2;
12616 * Bar.prototype.d = 4;
12618 * _.assign({ 'a': 0 }, new Foo, new Bar);
12619 * // => { 'a': 1, 'c': 3 }
12621 var assign = createAssigner(function(object, source) {
12622 if (isPrototype(source) || isArrayLike(source)) {
12623 copyObject(source, keys(source), object);
12626 for (var key in source) {
12627 if (hasOwnProperty.call(source, key)) {
12628 assignValue(object, key, source[key]);
12634 * This method is like `_.assign` except that it iterates over own and
12635 * inherited source properties.
12637 * **Note:** This method mutates `object`.
12644 * @param {Object} object The destination object.
12645 * @param {...Object} [sources] The source objects.
12646 * @returns {Object} Returns `object`.
12658 * Foo.prototype.b = 2;
12659 * Bar.prototype.d = 4;
12661 * _.assignIn({ 'a': 0 }, new Foo, new Bar);
12662 * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }
12664 var assignIn = createAssigner(function(object, source) {
12665 copyObject(source, keysIn(source), object);
12669 * This method is like `_.assignIn` except that it accepts `customizer`
12670 * which is invoked to produce the assigned values. If `customizer` returns
12671 * `undefined`, assignment is handled by the method instead. The `customizer`
12672 * is invoked with five arguments: (objValue, srcValue, key, object, source).
12674 * **Note:** This method mutates `object`.
12679 * @alias extendWith
12681 * @param {Object} object The destination object.
12682 * @param {...Object} sources The source objects.
12683 * @param {Function} [customizer] The function to customize assigned values.
12684 * @returns {Object} Returns `object`.
12685 * @see _.assignWith
12688 * function customizer(objValue, srcValue) {
12689 * return _.isUndefined(objValue) ? srcValue : objValue;
12692 * var defaults = _.partialRight(_.assignInWith, customizer);
12694 * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
12695 * // => { 'a': 1, 'b': 2 }
12697 var assignInWith = createAssigner(function(object, source, srcIndex, customizer) {
12698 copyObject(source, keysIn(source), object, customizer);
12702 * This method is like `_.assign` except that it accepts `customizer`
12703 * which is invoked to produce the assigned values. If `customizer` returns
12704 * `undefined`, assignment is handled by the method instead. The `customizer`
12705 * is invoked with five arguments: (objValue, srcValue, key, object, source).
12707 * **Note:** This method mutates `object`.
12713 * @param {Object} object The destination object.
12714 * @param {...Object} sources The source objects.
12715 * @param {Function} [customizer] The function to customize assigned values.
12716 * @returns {Object} Returns `object`.
12717 * @see _.assignInWith
12720 * function customizer(objValue, srcValue) {
12721 * return _.isUndefined(objValue) ? srcValue : objValue;
12724 * var defaults = _.partialRight(_.assignWith, customizer);
12726 * defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
12727 * // => { 'a': 1, 'b': 2 }
12729 var assignWith = createAssigner(function(object, source, srcIndex, customizer) {
12730 copyObject(source, keys(source), object, customizer);
12734 * Creates an array of values corresponding to `paths` of `object`.
12740 * @param {Object} object The object to iterate over.
12741 * @param {...(string|string[])} [paths] The property paths to pick.
12742 * @returns {Array} Returns the picked values.
12745 * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
12747 * _.at(object, ['a[0].b.c', 'a[1]']);
12750 var at = flatRest(baseAt);
12753 * Creates an object that inherits from the `prototype` object. If a
12754 * `properties` object is given, its own enumerable string keyed properties
12755 * are assigned to the created object.
12761 * @param {Object} prototype The object to inherit from.
12762 * @param {Object} [properties] The properties to assign to the object.
12763 * @returns {Object} Returns the new object.
12766 * function Shape() {
12771 * function Circle() {
12772 * Shape.call(this);
12775 * Circle.prototype = _.create(Shape.prototype, {
12776 * 'constructor': Circle
12779 * var circle = new Circle;
12780 * circle instanceof Circle;
12783 * circle instanceof Shape;
12786 function create(prototype, properties) {
12787 var result = baseCreate(prototype);
12788 return properties == null ? result : baseAssign(result, properties);
12792 * Assigns own and inherited enumerable string keyed properties of source
12793 * objects to the destination object for all destination properties that
12794 * resolve to `undefined`. Source objects are applied from left to right.
12795 * Once a property is set, additional values of the same property are ignored.
12797 * **Note:** This method mutates `object`.
12803 * @param {Object} object The destination object.
12804 * @param {...Object} [sources] The source objects.
12805 * @returns {Object} Returns `object`.
12806 * @see _.defaultsDeep
12809 * _.defaults({ 'a': 1 }, { 'b': 2 }, { 'a': 3 });
12810 * // => { 'a': 1, 'b': 2 }
12812 var defaults = baseRest(function(object, sources) {
12813 object = Object(object);
12816 var length = sources.length;
12817 var guard = length > 2 ? sources[2] : undefined;
12819 if (guard && isIterateeCall(sources[0], sources[1], guard)) {
12823 while (++index < length) {
12824 var source = sources[index];
12825 var props = keysIn(source);
12826 var propsIndex = -1;
12827 var propsLength = props.length;
12829 while (++propsIndex < propsLength) {
12830 var key = props[propsIndex];
12831 var value = object[key];
12833 if (value === undefined ||
12834 (eq(value, objectProto[key]) && !hasOwnProperty.call(object, key))) {
12835 object[key] = source[key];
12844 * This method is like `_.defaults` except that it recursively assigns
12845 * default properties.
12847 * **Note:** This method mutates `object`.
12853 * @param {Object} object The destination object.
12854 * @param {...Object} [sources] The source objects.
12855 * @returns {Object} Returns `object`.
12859 * _.defaultsDeep({ 'a': { 'b': 2 } }, { 'a': { 'b': 1, 'c': 3 } });
12860 * // => { 'a': { 'b': 2, 'c': 3 } }
12862 var defaultsDeep = baseRest(function(args) {
12863 args.push(undefined, customDefaultsMerge);
12864 return apply(mergeWith, undefined, args);
12868 * This method is like `_.find` except that it returns the key of the first
12869 * element `predicate` returns truthy for instead of the element itself.
12875 * @param {Object} object The object to inspect.
12876 * @param {Function} [predicate=_.identity] The function invoked per iteration.
12877 * @returns {string|undefined} Returns the key of the matched element,
12878 * else `undefined`.
12882 * 'barney': { 'age': 36, 'active': true },
12883 * 'fred': { 'age': 40, 'active': false },
12884 * 'pebbles': { 'age': 1, 'active': true }
12887 * _.findKey(users, function(o) { return o.age < 40; });
12888 * // => 'barney' (iteration order is not guaranteed)
12890 * // The `_.matches` iteratee shorthand.
12891 * _.findKey(users, { 'age': 1, 'active': true });
12894 * // The `_.matchesProperty` iteratee shorthand.
12895 * _.findKey(users, ['active', false]);
12898 * // The `_.property` iteratee shorthand.
12899 * _.findKey(users, 'active');
12902 function findKey(object, predicate) {
12903 return baseFindKey(object, getIteratee(predicate, 3), baseForOwn);
12907 * This method is like `_.findKey` except that it iterates over elements of
12908 * a collection in the opposite order.
12914 * @param {Object} object The object to inspect.
12915 * @param {Function} [predicate=_.identity] The function invoked per iteration.
12916 * @returns {string|undefined} Returns the key of the matched element,
12917 * else `undefined`.
12921 * 'barney': { 'age': 36, 'active': true },
12922 * 'fred': { 'age': 40, 'active': false },
12923 * 'pebbles': { 'age': 1, 'active': true }
12926 * _.findLastKey(users, function(o) { return o.age < 40; });
12927 * // => returns 'pebbles' assuming `_.findKey` returns 'barney'
12929 * // The `_.matches` iteratee shorthand.
12930 * _.findLastKey(users, { 'age': 36, 'active': true });
12933 * // The `_.matchesProperty` iteratee shorthand.
12934 * _.findLastKey(users, ['active', false]);
12937 * // The `_.property` iteratee shorthand.
12938 * _.findLastKey(users, 'active');
12941 function findLastKey(object, predicate) {
12942 return baseFindKey(object, getIteratee(predicate, 3), baseForOwnRight);
12946 * Iterates over own and inherited enumerable string keyed properties of an
12947 * object and invokes `iteratee` for each property. The iteratee is invoked
12948 * with three arguments: (value, key, object). Iteratee functions may exit
12949 * iteration early by explicitly returning `false`.
12955 * @param {Object} object The object to iterate over.
12956 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
12957 * @returns {Object} Returns `object`.
12958 * @see _.forInRight
12966 * Foo.prototype.c = 3;
12968 * _.forIn(new Foo, function(value, key) {
12969 * console.log(key);
12971 * // => Logs 'a', 'b', then 'c' (iteration order is not guaranteed).
12973 function forIn(object, iteratee) {
12974 return object == null
12976 : baseFor(object, getIteratee(iteratee, 3), keysIn);
12980 * This method is like `_.forIn` except that it iterates over properties of
12981 * `object` in the opposite order.
12987 * @param {Object} object The object to iterate over.
12988 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
12989 * @returns {Object} Returns `object`.
12998 * Foo.prototype.c = 3;
13000 * _.forInRight(new Foo, function(value, key) {
13001 * console.log(key);
13003 * // => Logs 'c', 'b', then 'a' assuming `_.forIn` logs 'a', 'b', then 'c'.
13005 function forInRight(object, iteratee) {
13006 return object == null
13008 : baseForRight(object, getIteratee(iteratee, 3), keysIn);
13012 * Iterates over own enumerable string keyed properties of an object and
13013 * invokes `iteratee` for each property. The iteratee is invoked with three
13014 * arguments: (value, key, object). Iteratee functions may exit iteration
13015 * early by explicitly returning `false`.
13021 * @param {Object} object The object to iterate over.
13022 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
13023 * @returns {Object} Returns `object`.
13024 * @see _.forOwnRight
13032 * Foo.prototype.c = 3;
13034 * _.forOwn(new Foo, function(value, key) {
13035 * console.log(key);
13037 * // => Logs 'a' then 'b' (iteration order is not guaranteed).
13039 function forOwn(object, iteratee) {
13040 return object && baseForOwn(object, getIteratee(iteratee, 3));
13044 * This method is like `_.forOwn` except that it iterates over properties of
13045 * `object` in the opposite order.
13051 * @param {Object} object The object to iterate over.
13052 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
13053 * @returns {Object} Returns `object`.
13062 * Foo.prototype.c = 3;
13064 * _.forOwnRight(new Foo, function(value, key) {
13065 * console.log(key);
13067 * // => Logs 'b' then 'a' assuming `_.forOwn` logs 'a' then 'b'.
13069 function forOwnRight(object, iteratee) {
13070 return object && baseForOwnRight(object, getIteratee(iteratee, 3));
13074 * Creates an array of function property names from own enumerable properties
13081 * @param {Object} object The object to inspect.
13082 * @returns {Array} Returns the function names.
13083 * @see _.functionsIn
13087 * this.a = _.constant('a');
13088 * this.b = _.constant('b');
13091 * Foo.prototype.c = _.constant('c');
13093 * _.functions(new Foo);
13096 function functions(object) {
13097 return object == null ? [] : baseFunctions(object, keys(object));
13101 * Creates an array of function property names from own and inherited
13102 * enumerable properties of `object`.
13108 * @param {Object} object The object to inspect.
13109 * @returns {Array} Returns the function names.
13114 * this.a = _.constant('a');
13115 * this.b = _.constant('b');
13118 * Foo.prototype.c = _.constant('c');
13120 * _.functionsIn(new Foo);
13121 * // => ['a', 'b', 'c']
13123 function functionsIn(object) {
13124 return object == null ? [] : baseFunctions(object, keysIn(object));
13128 * Gets the value at `path` of `object`. If the resolved value is
13129 * `undefined`, the `defaultValue` is returned in its place.
13135 * @param {Object} object The object to query.
13136 * @param {Array|string} path The path of the property to get.
13137 * @param {*} [defaultValue] The value returned for `undefined` resolved values.
13138 * @returns {*} Returns the resolved value.
13141 * var object = { 'a': [{ 'b': { 'c': 3 } }] };
13143 * _.get(object, 'a[0].b.c');
13146 * _.get(object, ['a', '0', 'b', 'c']);
13149 * _.get(object, 'a.b.c', 'default');
13152 function get(object, path, defaultValue) {
13153 var result = object == null ? undefined : baseGet(object, path);
13154 return result === undefined ? defaultValue : result;
13158 * Checks if `path` is a direct property of `object`.
13164 * @param {Object} object The object to query.
13165 * @param {Array|string} path The path to check.
13166 * @returns {boolean} Returns `true` if `path` exists, else `false`.
13169 * var object = { 'a': { 'b': 2 } };
13170 * var other = _.create({ 'a': _.create({ 'b': 2 }) });
13172 * _.has(object, 'a');
13175 * _.has(object, 'a.b');
13178 * _.has(object, ['a', 'b']);
13181 * _.has(other, 'a');
13184 function has(object, path) {
13185 return object != null && hasPath(object, path, baseHas);
13189 * Checks if `path` is a direct or inherited property of `object`.
13195 * @param {Object} object The object to query.
13196 * @param {Array|string} path The path to check.
13197 * @returns {boolean} Returns `true` if `path` exists, else `false`.
13200 * var object = _.create({ 'a': _.create({ 'b': 2 }) });
13202 * _.hasIn(object, 'a');
13205 * _.hasIn(object, 'a.b');
13208 * _.hasIn(object, ['a', 'b']);
13211 * _.hasIn(object, 'b');
13214 function hasIn(object, path) {
13215 return object != null && hasPath(object, path, baseHasIn);
13219 * Creates an object composed of the inverted keys and values of `object`.
13220 * If `object` contains duplicate values, subsequent values overwrite
13221 * property assignments of previous values.
13227 * @param {Object} object The object to invert.
13228 * @returns {Object} Returns the new inverted object.
13231 * var object = { 'a': 1, 'b': 2, 'c': 1 };
13233 * _.invert(object);
13234 * // => { '1': 'c', '2': 'b' }
13236 var invert = createInverter(function(result, value, key) {
13237 if (value != null &&
13238 typeof value.toString != 'function') {
13239 value = nativeObjectToString.call(value);
13242 result[value] = key;
13243 }, constant(identity));
13246 * This method is like `_.invert` except that the inverted object is generated
13247 * from the results of running each element of `object` thru `iteratee`. The
13248 * corresponding inverted value of each inverted key is an array of keys
13249 * responsible for generating the inverted value. The iteratee is invoked
13250 * with one argument: (value).
13256 * @param {Object} object The object to invert.
13257 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
13258 * @returns {Object} Returns the new inverted object.
13261 * var object = { 'a': 1, 'b': 2, 'c': 1 };
13263 * _.invertBy(object);
13264 * // => { '1': ['a', 'c'], '2': ['b'] }
13266 * _.invertBy(object, function(value) {
13267 * return 'group' + value;
13269 * // => { 'group1': ['a', 'c'], 'group2': ['b'] }
13271 var invertBy = createInverter(function(result, value, key) {
13272 if (value != null &&
13273 typeof value.toString != 'function') {
13274 value = nativeObjectToString.call(value);
13277 if (hasOwnProperty.call(result, value)) {
13278 result[value].push(key);
13280 result[value] = [key];
13285 * Invokes the method at `path` of `object`.
13291 * @param {Object} object The object to query.
13292 * @param {Array|string} path The path of the method to invoke.
13293 * @param {...*} [args] The arguments to invoke the method with.
13294 * @returns {*} Returns the result of the invoked method.
13297 * var object = { 'a': [{ 'b': { 'c': [1, 2, 3, 4] } }] };
13299 * _.invoke(object, 'a[0].b.c.slice', 1, 3);
13302 var invoke = baseRest(baseInvoke);
13305 * Creates an array of the own enumerable property names of `object`.
13307 * **Note:** Non-object values are coerced to objects. See the
13308 * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)
13309 * for more details.
13315 * @param {Object} object The object to query.
13316 * @returns {Array} Returns the array of property names.
13324 * Foo.prototype.c = 3;
13327 * // => ['a', 'b'] (iteration order is not guaranteed)
13332 function keys(object) {
13333 return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);
13337 * Creates an array of the own and inherited enumerable property names of `object`.
13339 * **Note:** Non-object values are coerced to objects.
13345 * @param {Object} object The object to query.
13346 * @returns {Array} Returns the array of property names.
13354 * Foo.prototype.c = 3;
13356 * _.keysIn(new Foo);
13357 * // => ['a', 'b', 'c'] (iteration order is not guaranteed)
13359 function keysIn(object) {
13360 return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);
13364 * The opposite of `_.mapValues`; this method creates an object with the
13365 * same values as `object` and keys generated by running each own enumerable
13366 * string keyed property of `object` thru `iteratee`. The iteratee is invoked
13367 * with three arguments: (value, key, object).
13373 * @param {Object} object The object to iterate over.
13374 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
13375 * @returns {Object} Returns the new mapped object.
13379 * _.mapKeys({ 'a': 1, 'b': 2 }, function(value, key) {
13380 * return key + value;
13382 * // => { 'a1': 1, 'b2': 2 }
13384 function mapKeys(object, iteratee) {
13386 iteratee = getIteratee(iteratee, 3);
13388 baseForOwn(object, function(value, key, object) {
13389 baseAssignValue(result, iteratee(value, key, object), value);
13395 * Creates an object with the same keys as `object` and values generated
13396 * by running each own enumerable string keyed property of `object` thru
13397 * `iteratee`. The iteratee is invoked with three arguments:
13398 * (value, key, object).
13404 * @param {Object} object The object to iterate over.
13405 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
13406 * @returns {Object} Returns the new mapped object.
13411 * 'fred': { 'user': 'fred', 'age': 40 },
13412 * 'pebbles': { 'user': 'pebbles', 'age': 1 }
13415 * _.mapValues(users, function(o) { return o.age; });
13416 * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
13418 * // The `_.property` iteratee shorthand.
13419 * _.mapValues(users, 'age');
13420 * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed)
13422 function mapValues(object, iteratee) {
13424 iteratee = getIteratee(iteratee, 3);
13426 baseForOwn(object, function(value, key, object) {
13427 baseAssignValue(result, key, iteratee(value, key, object));
13433 * This method is like `_.assign` except that it recursively merges own and
13434 * inherited enumerable string keyed properties of source objects into the
13435 * destination object. Source properties that resolve to `undefined` are
13436 * skipped if a destination value exists. Array and plain object properties
13437 * are merged recursively. Other objects and value types are overridden by
13438 * assignment. Source objects are applied from left to right. Subsequent
13439 * sources overwrite property assignments of previous sources.
13441 * **Note:** This method mutates `object`.
13447 * @param {Object} object The destination object.
13448 * @param {...Object} [sources] The source objects.
13449 * @returns {Object} Returns `object`.
13453 * 'a': [{ 'b': 2 }, { 'd': 4 }]
13457 * 'a': [{ 'c': 3 }, { 'e': 5 }]
13460 * _.merge(object, other);
13461 * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }
13463 var merge = createAssigner(function(object, source, srcIndex) {
13464 baseMerge(object, source, srcIndex);
13468 * This method is like `_.merge` except that it accepts `customizer` which
13469 * is invoked to produce the merged values of the destination and source
13470 * properties. If `customizer` returns `undefined`, merging is handled by the
13471 * method instead. The `customizer` is invoked with six arguments:
13472 * (objValue, srcValue, key, object, source, stack).
13474 * **Note:** This method mutates `object`.
13480 * @param {Object} object The destination object.
13481 * @param {...Object} sources The source objects.
13482 * @param {Function} customizer The function to customize assigned values.
13483 * @returns {Object} Returns `object`.
13486 * function customizer(objValue, srcValue) {
13487 * if (_.isArray(objValue)) {
13488 * return objValue.concat(srcValue);
13492 * var object = { 'a': [1], 'b': [2] };
13493 * var other = { 'a': [3], 'b': [4] };
13495 * _.mergeWith(object, other, customizer);
13496 * // => { 'a': [1, 3], 'b': [2, 4] }
13498 var mergeWith = createAssigner(function(object, source, srcIndex, customizer) {
13499 baseMerge(object, source, srcIndex, customizer);
13503 * The opposite of `_.pick`; this method creates an object composed of the
13504 * own and inherited enumerable property paths of `object` that are not omitted.
13506 * **Note:** This method is considerably slower than `_.pick`.
13512 * @param {Object} object The source object.
13513 * @param {...(string|string[])} [paths] The property paths to omit.
13514 * @returns {Object} Returns the new object.
13517 * var object = { 'a': 1, 'b': '2', 'c': 3 };
13519 * _.omit(object, ['a', 'c']);
13520 * // => { 'b': '2' }
13522 var omit = flatRest(function(object, paths) {
13524 if (object == null) {
13527 var isDeep = false;
13528 paths = arrayMap(paths, function(path) {
13529 path = castPath(path, object);
13530 isDeep || (isDeep = path.length > 1);
13533 copyObject(object, getAllKeysIn(object), result);
13535 result = baseClone(result, CLONE_DEEP_FLAG | CLONE_FLAT_FLAG | CLONE_SYMBOLS_FLAG, customOmitClone);
13537 var length = paths.length;
13539 baseUnset(result, paths[length]);
13545 * The opposite of `_.pickBy`; this method creates an object composed of
13546 * the own and inherited enumerable string keyed properties of `object` that
13547 * `predicate` doesn't return truthy for. The predicate is invoked with two
13548 * arguments: (value, key).
13554 * @param {Object} object The source object.
13555 * @param {Function} [predicate=_.identity] The function invoked per property.
13556 * @returns {Object} Returns the new object.
13559 * var object = { 'a': 1, 'b': '2', 'c': 3 };
13561 * _.omitBy(object, _.isNumber);
13562 * // => { 'b': '2' }
13564 function omitBy(object, predicate) {
13565 return pickBy(object, negate(getIteratee(predicate)));
13569 * Creates an object composed of the picked `object` properties.
13575 * @param {Object} object The source object.
13576 * @param {...(string|string[])} [paths] The property paths to pick.
13577 * @returns {Object} Returns the new object.
13580 * var object = { 'a': 1, 'b': '2', 'c': 3 };
13582 * _.pick(object, ['a', 'c']);
13583 * // => { 'a': 1, 'c': 3 }
13585 var pick = flatRest(function(object, paths) {
13586 return object == null ? {} : basePick(object, paths);
13590 * Creates an object composed of the `object` properties `predicate` returns
13591 * truthy for. The predicate is invoked with two arguments: (value, key).
13597 * @param {Object} object The source object.
13598 * @param {Function} [predicate=_.identity] The function invoked per property.
13599 * @returns {Object} Returns the new object.
13602 * var object = { 'a': 1, 'b': '2', 'c': 3 };
13604 * _.pickBy(object, _.isNumber);
13605 * // => { 'a': 1, 'c': 3 }
13607 function pickBy(object, predicate) {
13608 if (object == null) {
13611 var props = arrayMap(getAllKeysIn(object), function(prop) {
13614 predicate = getIteratee(predicate);
13615 return basePickBy(object, props, function(value, path) {
13616 return predicate(value, path[0]);
13621 * This method is like `_.get` except that if the resolved value is a
13622 * function it's invoked with the `this` binding of its parent object and
13623 * its result is returned.
13629 * @param {Object} object The object to query.
13630 * @param {Array|string} path The path of the property to resolve.
13631 * @param {*} [defaultValue] The value returned for `undefined` resolved values.
13632 * @returns {*} Returns the resolved value.
13635 * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };
13637 * _.result(object, 'a[0].b.c1');
13640 * _.result(object, 'a[0].b.c2');
13643 * _.result(object, 'a[0].b.c3', 'default');
13646 * _.result(object, 'a[0].b.c3', _.constant('default'));
13649 function result(object, path, defaultValue) {
13650 path = castPath(path, object);
13653 length = path.length;
13655 // Ensure the loop is entered when path is empty.
13658 object = undefined;
13660 while (++index < length) {
13661 var value = object == null ? undefined : object[toKey(path[index])];
13662 if (value === undefined) {
13664 value = defaultValue;
13666 object = isFunction(value) ? value.call(object) : value;
13672 * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,
13673 * it's created. Arrays are created for missing index properties while objects
13674 * are created for all other missing properties. Use `_.setWith` to customize
13677 * **Note:** This method mutates `object`.
13683 * @param {Object} object The object to modify.
13684 * @param {Array|string} path The path of the property to set.
13685 * @param {*} value The value to set.
13686 * @returns {Object} Returns `object`.
13689 * var object = { 'a': [{ 'b': { 'c': 3 } }] };
13691 * _.set(object, 'a[0].b.c', 4);
13692 * console.log(object.a[0].b.c);
13695 * _.set(object, ['x', '0', 'y', 'z'], 5);
13696 * console.log(object.x[0].y.z);
13699 function set(object, path, value) {
13700 return object == null ? object : baseSet(object, path, value);
13704 * This method is like `_.set` except that it accepts `customizer` which is
13705 * invoked to produce the objects of `path`. If `customizer` returns `undefined`
13706 * path creation is handled by the method instead. The `customizer` is invoked
13707 * with three arguments: (nsValue, key, nsObject).
13709 * **Note:** This method mutates `object`.
13715 * @param {Object} object The object to modify.
13716 * @param {Array|string} path The path of the property to set.
13717 * @param {*} value The value to set.
13718 * @param {Function} [customizer] The function to customize assigned values.
13719 * @returns {Object} Returns `object`.
13724 * _.setWith(object, '[0][1]', 'a', Object);
13725 * // => { '0': { '1': 'a' } }
13727 function setWith(object, path, value, customizer) {
13728 customizer = typeof customizer == 'function' ? customizer : undefined;
13729 return object == null ? object : baseSet(object, path, value, customizer);
13733 * Creates an array of own enumerable string keyed-value pairs for `object`
13734 * which can be consumed by `_.fromPairs`. If `object` is a map or set, its
13735 * entries are returned.
13742 * @param {Object} object The object to query.
13743 * @returns {Array} Returns the key-value pairs.
13751 * Foo.prototype.c = 3;
13753 * _.toPairs(new Foo);
13754 * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)
13756 var toPairs = createToPairs(keys);
13759 * Creates an array of own and inherited enumerable string keyed-value pairs
13760 * for `object` which can be consumed by `_.fromPairs`. If `object` is a map
13761 * or set, its entries are returned.
13768 * @param {Object} object The object to query.
13769 * @returns {Array} Returns the key-value pairs.
13777 * Foo.prototype.c = 3;
13779 * _.toPairsIn(new Foo);
13780 * // => [['a', 1], ['b', 2], ['c', 3]] (iteration order is not guaranteed)
13782 var toPairsIn = createToPairs(keysIn);
13785 * An alternative to `_.reduce`; this method transforms `object` to a new
13786 * `accumulator` object which is the result of running each of its own
13787 * enumerable string keyed properties thru `iteratee`, with each invocation
13788 * potentially mutating the `accumulator` object. If `accumulator` is not
13789 * provided, a new object with the same `[[Prototype]]` will be used. The
13790 * iteratee is invoked with four arguments: (accumulator, value, key, object).
13791 * Iteratee functions may exit iteration early by explicitly returning `false`.
13797 * @param {Object} object The object to iterate over.
13798 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
13799 * @param {*} [accumulator] The custom accumulator value.
13800 * @returns {*} Returns the accumulated value.
13803 * _.transform([2, 3, 4], function(result, n) {
13804 * result.push(n *= n);
13805 * return n % 2 == 0;
13809 * _.transform({ 'a': 1, 'b': 2, 'c': 1 }, function(result, value, key) {
13810 * (result[value] || (result[value] = [])).push(key);
13812 * // => { '1': ['a', 'c'], '2': ['b'] }
13814 function transform(object, iteratee, accumulator) {
13815 var isArr = isArray(object),
13816 isArrLike = isArr || isBuffer(object) || isTypedArray(object);
13818 iteratee = getIteratee(iteratee, 4);
13819 if (accumulator == null) {
13820 var Ctor = object && object.constructor;
13822 accumulator = isArr ? new Ctor : [];
13824 else if (isObject(object)) {
13825 accumulator = isFunction(Ctor) ? baseCreate(getPrototype(object)) : {};
13831 (isArrLike ? arrayEach : baseForOwn)(object, function(value, index, object) {
13832 return iteratee(accumulator, value, index, object);
13834 return accumulator;
13838 * Removes the property at `path` of `object`.
13840 * **Note:** This method mutates `object`.
13846 * @param {Object} object The object to modify.
13847 * @param {Array|string} path The path of the property to unset.
13848 * @returns {boolean} Returns `true` if the property is deleted, else `false`.
13851 * var object = { 'a': [{ 'b': { 'c': 7 } }] };
13852 * _.unset(object, 'a[0].b.c');
13855 * console.log(object);
13856 * // => { 'a': [{ 'b': {} }] };
13858 * _.unset(object, ['a', '0', 'b', 'c']);
13861 * console.log(object);
13862 * // => { 'a': [{ 'b': {} }] };
13864 function unset(object, path) {
13865 return object == null ? true : baseUnset(object, path);
13869 * This method is like `_.set` except that accepts `updater` to produce the
13870 * value to set. Use `_.updateWith` to customize `path` creation. The `updater`
13871 * is invoked with one argument: (value).
13873 * **Note:** This method mutates `object`.
13879 * @param {Object} object The object to modify.
13880 * @param {Array|string} path The path of the property to set.
13881 * @param {Function} updater The function to produce the updated value.
13882 * @returns {Object} Returns `object`.
13885 * var object = { 'a': [{ 'b': { 'c': 3 } }] };
13887 * _.update(object, 'a[0].b.c', function(n) { return n * n; });
13888 * console.log(object.a[0].b.c);
13891 * _.update(object, 'x[0].y.z', function(n) { return n ? n + 1 : 0; });
13892 * console.log(object.x[0].y.z);
13895 function update(object, path, updater) {
13896 return object == null ? object : baseUpdate(object, path, castFunction(updater));
13900 * This method is like `_.update` except that it accepts `customizer` which is
13901 * invoked to produce the objects of `path`. If `customizer` returns `undefined`
13902 * path creation is handled by the method instead. The `customizer` is invoked
13903 * with three arguments: (nsValue, key, nsObject).
13905 * **Note:** This method mutates `object`.
13911 * @param {Object} object The object to modify.
13912 * @param {Array|string} path The path of the property to set.
13913 * @param {Function} updater The function to produce the updated value.
13914 * @param {Function} [customizer] The function to customize assigned values.
13915 * @returns {Object} Returns `object`.
13920 * _.updateWith(object, '[0][1]', _.constant('a'), Object);
13921 * // => { '0': { '1': 'a' } }
13923 function updateWith(object, path, updater, customizer) {
13924 customizer = typeof customizer == 'function' ? customizer : undefined;
13925 return object == null ? object : baseUpdate(object, path, castFunction(updater), customizer);
13929 * Creates an array of the own enumerable string keyed property values of `object`.
13931 * **Note:** Non-object values are coerced to objects.
13937 * @param {Object} object The object to query.
13938 * @returns {Array} Returns the array of property values.
13946 * Foo.prototype.c = 3;
13948 * _.values(new Foo);
13949 * // => [1, 2] (iteration order is not guaranteed)
13954 function values(object) {
13955 return object == null ? [] : baseValues(object, keys(object));
13959 * Creates an array of the own and inherited enumerable string keyed property
13960 * values of `object`.
13962 * **Note:** Non-object values are coerced to objects.
13968 * @param {Object} object The object to query.
13969 * @returns {Array} Returns the array of property values.
13977 * Foo.prototype.c = 3;
13979 * _.valuesIn(new Foo);
13980 * // => [1, 2, 3] (iteration order is not guaranteed)
13982 function valuesIn(object) {
13983 return object == null ? [] : baseValues(object, keysIn(object));
13986 /*------------------------------------------------------------------------*/
13989 * Clamps `number` within the inclusive `lower` and `upper` bounds.
13995 * @param {number} number The number to clamp.
13996 * @param {number} [lower] The lower bound.
13997 * @param {number} upper The upper bound.
13998 * @returns {number} Returns the clamped number.
14001 * _.clamp(-10, -5, 5);
14004 * _.clamp(10, -5, 5);
14007 function clamp(number, lower, upper) {
14008 if (upper === undefined) {
14012 if (upper !== undefined) {
14013 upper = toNumber(upper);
14014 upper = upper === upper ? upper : 0;
14016 if (lower !== undefined) {
14017 lower = toNumber(lower);
14018 lower = lower === lower ? lower : 0;
14020 return baseClamp(toNumber(number), lower, upper);
14024 * Checks if `n` is between `start` and up to, but not including, `end`. If
14025 * `end` is not specified, it's set to `start` with `start` then set to `0`.
14026 * If `start` is greater than `end` the params are swapped to support
14033 * @param {number} number The number to check.
14034 * @param {number} [start=0] The start of the range.
14035 * @param {number} end The end of the range.
14036 * @returns {boolean} Returns `true` if `number` is in the range, else `false`.
14037 * @see _.range, _.rangeRight
14040 * _.inRange(3, 2, 4);
14052 * _.inRange(1.2, 2);
14055 * _.inRange(5.2, 4);
14058 * _.inRange(-3, -2, -6);
14061 function inRange(number, start, end) {
14062 start = toFinite(start);
14063 if (end === undefined) {
14067 end = toFinite(end);
14069 number = toNumber(number);
14070 return baseInRange(number, start, end);
14074 * Produces a random number between the inclusive `lower` and `upper` bounds.
14075 * If only one argument is provided a number between `0` and the given number
14076 * is returned. If `floating` is `true`, or either `lower` or `upper` are
14077 * floats, a floating-point number is returned instead of an integer.
14079 * **Note:** JavaScript follows the IEEE-754 standard for resolving
14080 * floating-point values which can produce unexpected results.
14086 * @param {number} [lower=0] The lower bound.
14087 * @param {number} [upper=1] The upper bound.
14088 * @param {boolean} [floating] Specify returning a floating-point number.
14089 * @returns {number} Returns the random number.
14093 * // => an integer between 0 and 5
14096 * // => also an integer between 0 and 5
14098 * _.random(5, true);
14099 * // => a floating-point number between 0 and 5
14101 * _.random(1.2, 5.2);
14102 * // => a floating-point number between 1.2 and 5.2
14104 function random(lower, upper, floating) {
14105 if (floating && typeof floating != 'boolean' && isIterateeCall(lower, upper, floating)) {
14106 upper = floating = undefined;
14108 if (floating === undefined) {
14109 if (typeof upper == 'boolean') {
14113 else if (typeof lower == 'boolean') {
14118 if (lower === undefined && upper === undefined) {
14123 lower = toFinite(lower);
14124 if (upper === undefined) {
14128 upper = toFinite(upper);
14131 if (lower > upper) {
14136 if (floating || lower % 1 || upper % 1) {
14137 var rand = nativeRandom();
14138 return nativeMin(lower + (rand * (upper - lower + freeParseFloat('1e-' + ((rand + '').length - 1)))), upper);
14140 return baseRandom(lower, upper);
14143 /*------------------------------------------------------------------------*/
14146 * Converts `string` to [camel case](https://en.wikipedia.org/wiki/CamelCase).
14152 * @param {string} [string=''] The string to convert.
14153 * @returns {string} Returns the camel cased string.
14156 * _.camelCase('Foo Bar');
14159 * _.camelCase('--foo-bar--');
14162 * _.camelCase('__FOO_BAR__');
14165 var camelCase = createCompounder(function(result, word, index) {
14166 word = word.toLowerCase();
14167 return result + (index ? capitalize(word) : word);
14171 * Converts the first character of `string` to upper case and the remaining
14178 * @param {string} [string=''] The string to capitalize.
14179 * @returns {string} Returns the capitalized string.
14182 * _.capitalize('FRED');
14185 function capitalize(string) {
14186 return upperFirst(toString(string).toLowerCase());
14190 * Deburrs `string` by converting
14191 * [Latin-1 Supplement](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table)
14192 * and [Latin Extended-A](https://en.wikipedia.org/wiki/Latin_Extended-A)
14193 * letters to basic Latin letters and removing
14194 * [combining diacritical marks](https://en.wikipedia.org/wiki/Combining_Diacritical_Marks).
14200 * @param {string} [string=''] The string to deburr.
14201 * @returns {string} Returns the deburred string.
14204 * _.deburr('déjà vu');
14207 function deburr(string) {
14208 string = toString(string);
14209 return string && string.replace(reLatin, deburrLetter).replace(reComboMark, '');
14213 * Checks if `string` ends with the given target string.
14219 * @param {string} [string=''] The string to inspect.
14220 * @param {string} [target] The string to search for.
14221 * @param {number} [position=string.length] The position to search up to.
14222 * @returns {boolean} Returns `true` if `string` ends with `target`,
14226 * _.endsWith('abc', 'c');
14229 * _.endsWith('abc', 'b');
14232 * _.endsWith('abc', 'b', 2);
14235 function endsWith(string, target, position) {
14236 string = toString(string);
14237 target = baseToString(target);
14239 var length = string.length;
14240 position = position === undefined
14242 : baseClamp(toInteger(position), 0, length);
14244 var end = position;
14245 position -= target.length;
14246 return position >= 0 && string.slice(position, end) == target;
14250 * Converts the characters "&", "<", ">", '"', and "'" in `string` to their
14251 * corresponding HTML entities.
14253 * **Note:** No other characters are escaped. To escape additional
14254 * characters use a third-party library like [_he_](https://mths.be/he).
14256 * Though the ">" character is escaped for symmetry, characters like
14257 * ">" and "/" don't need escaping in HTML and have no special meaning
14258 * unless they're part of a tag or unquoted attribute value. See
14259 * [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands)
14260 * (under "semi-related fun fact") for more details.
14262 * When working with HTML you should always
14263 * [quote attribute values](http://wonko.com/post/html-escaping) to reduce
14270 * @param {string} [string=''] The string to escape.
14271 * @returns {string} Returns the escaped string.
14274 * _.escape('fred, barney, & pebbles');
14275 * // => 'fred, barney, & pebbles'
14277 function escape(string) {
14278 string = toString(string);
14279 return (string && reHasUnescapedHtml.test(string))
14280 ? string.replace(reUnescapedHtml, escapeHtmlChar)
14285 * Escapes the `RegExp` special characters "^", "$", "\", ".", "*", "+",
14286 * "?", "(", ")", "[", "]", "{", "}", and "|" in `string`.
14292 * @param {string} [string=''] The string to escape.
14293 * @returns {string} Returns the escaped string.
14296 * _.escapeRegExp('[lodash](https://lodash.com/)');
14297 * // => '\[lodash\]\(https://lodash\.com/\)'
14299 function escapeRegExp(string) {
14300 string = toString(string);
14301 return (string && reHasRegExpChar.test(string))
14302 ? string.replace(reRegExpChar, '\\$&')
14307 * Converts `string` to
14308 * [kebab case](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles).
14314 * @param {string} [string=''] The string to convert.
14315 * @returns {string} Returns the kebab cased string.
14318 * _.kebabCase('Foo Bar');
14321 * _.kebabCase('fooBar');
14324 * _.kebabCase('__FOO_BAR__');
14327 var kebabCase = createCompounder(function(result, word, index) {
14328 return result + (index ? '-' : '') + word.toLowerCase();
14332 * Converts `string`, as space separated words, to lower case.
14338 * @param {string} [string=''] The string to convert.
14339 * @returns {string} Returns the lower cased string.
14342 * _.lowerCase('--Foo-Bar--');
14345 * _.lowerCase('fooBar');
14348 * _.lowerCase('__FOO_BAR__');
14351 var lowerCase = createCompounder(function(result, word, index) {
14352 return result + (index ? ' ' : '') + word.toLowerCase();
14356 * Converts the first character of `string` to lower case.
14362 * @param {string} [string=''] The string to convert.
14363 * @returns {string} Returns the converted string.
14366 * _.lowerFirst('Fred');
14369 * _.lowerFirst('FRED');
14372 var lowerFirst = createCaseFirst('toLowerCase');
14375 * Pads `string` on the left and right sides if it's shorter than `length`.
14376 * Padding characters are truncated if they can't be evenly divided by `length`.
14382 * @param {string} [string=''] The string to pad.
14383 * @param {number} [length=0] The padding length.
14384 * @param {string} [chars=' '] The string used as padding.
14385 * @returns {string} Returns the padded string.
14391 * _.pad('abc', 8, '_-');
14397 function pad(string, length, chars) {
14398 string = toString(string);
14399 length = toInteger(length);
14401 var strLength = length ? stringSize(string) : 0;
14402 if (!length || strLength >= length) {
14405 var mid = (length - strLength) / 2;
14407 createPadding(nativeFloor(mid), chars) +
14409 createPadding(nativeCeil(mid), chars)
14414 * Pads `string` on the right side if it's shorter than `length`. Padding
14415 * characters are truncated if they exceed `length`.
14421 * @param {string} [string=''] The string to pad.
14422 * @param {number} [length=0] The padding length.
14423 * @param {string} [chars=' '] The string used as padding.
14424 * @returns {string} Returns the padded string.
14427 * _.padEnd('abc', 6);
14430 * _.padEnd('abc', 6, '_-');
14433 * _.padEnd('abc', 3);
14436 function padEnd(string, length, chars) {
14437 string = toString(string);
14438 length = toInteger(length);
14440 var strLength = length ? stringSize(string) : 0;
14441 return (length && strLength < length)
14442 ? (string + createPadding(length - strLength, chars))
14447 * Pads `string` on the left side if it's shorter than `length`. Padding
14448 * characters are truncated if they exceed `length`.
14454 * @param {string} [string=''] The string to pad.
14455 * @param {number} [length=0] The padding length.
14456 * @param {string} [chars=' '] The string used as padding.
14457 * @returns {string} Returns the padded string.
14460 * _.padStart('abc', 6);
14463 * _.padStart('abc', 6, '_-');
14466 * _.padStart('abc', 3);
14469 function padStart(string, length, chars) {
14470 string = toString(string);
14471 length = toInteger(length);
14473 var strLength = length ? stringSize(string) : 0;
14474 return (length && strLength < length)
14475 ? (createPadding(length - strLength, chars) + string)
14480 * Converts `string` to an integer of the specified radix. If `radix` is
14481 * `undefined` or `0`, a `radix` of `10` is used unless `value` is a
14482 * hexadecimal, in which case a `radix` of `16` is used.
14484 * **Note:** This method aligns with the
14485 * [ES5 implementation](https://es5.github.io/#x15.1.2.2) of `parseInt`.
14491 * @param {string} string The string to convert.
14492 * @param {number} [radix=10] The radix to interpret `value` by.
14493 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
14494 * @returns {number} Returns the converted integer.
14497 * _.parseInt('08');
14500 * _.map(['6', '08', '10'], _.parseInt);
14503 function parseInt(string, radix, guard) {
14504 if (guard || radix == null) {
14506 } else if (radix) {
14509 return nativeParseInt(toString(string).replace(reTrimStart, ''), radix || 0);
14513 * Repeats the given string `n` times.
14519 * @param {string} [string=''] The string to repeat.
14520 * @param {number} [n=1] The number of times to repeat the string.
14521 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
14522 * @returns {string} Returns the repeated string.
14525 * _.repeat('*', 3);
14528 * _.repeat('abc', 2);
14531 * _.repeat('abc', 0);
14534 function repeat(string, n, guard) {
14535 if ((guard ? isIterateeCall(string, n, guard) : n === undefined)) {
14540 return baseRepeat(toString(string), n);
14544 * Replaces matches for `pattern` in `string` with `replacement`.
14546 * **Note:** This method is based on
14547 * [`String#replace`](https://mdn.io/String/replace).
14553 * @param {string} [string=''] The string to modify.
14554 * @param {RegExp|string} pattern The pattern to replace.
14555 * @param {Function|string} replacement The match replacement.
14556 * @returns {string} Returns the modified string.
14559 * _.replace('Hi Fred', 'Fred', 'Barney');
14560 * // => 'Hi Barney'
14562 function replace() {
14563 var args = arguments,
14564 string = toString(args[0]);
14566 return args.length < 3 ? string : string.replace(args[1], args[2]);
14570 * Converts `string` to
14571 * [snake case](https://en.wikipedia.org/wiki/Snake_case).
14577 * @param {string} [string=''] The string to convert.
14578 * @returns {string} Returns the snake cased string.
14581 * _.snakeCase('Foo Bar');
14584 * _.snakeCase('fooBar');
14587 * _.snakeCase('--FOO-BAR--');
14590 var snakeCase = createCompounder(function(result, word, index) {
14591 return result + (index ? '_' : '') + word.toLowerCase();
14595 * Splits `string` by `separator`.
14597 * **Note:** This method is based on
14598 * [`String#split`](https://mdn.io/String/split).
14604 * @param {string} [string=''] The string to split.
14605 * @param {RegExp|string} separator The separator pattern to split by.
14606 * @param {number} [limit] The length to truncate results to.
14607 * @returns {Array} Returns the string segments.
14610 * _.split('a-b-c', '-', 2);
14613 function split(string, separator, limit) {
14614 if (limit && typeof limit != 'number' && isIterateeCall(string, separator, limit)) {
14615 separator = limit = undefined;
14617 limit = limit === undefined ? MAX_ARRAY_LENGTH : limit >>> 0;
14621 string = toString(string);
14623 typeof separator == 'string' ||
14624 (separator != null && !isRegExp(separator))
14626 separator = baseToString(separator);
14627 if (!separator && hasUnicode(string)) {
14628 return castSlice(stringToArray(string), 0, limit);
14631 return string.split(separator, limit);
14635 * Converts `string` to
14636 * [start case](https://en.wikipedia.org/wiki/Letter_case#Stylistic_or_specialised_usage).
14642 * @param {string} [string=''] The string to convert.
14643 * @returns {string} Returns the start cased string.
14646 * _.startCase('--foo-bar--');
14649 * _.startCase('fooBar');
14652 * _.startCase('__FOO_BAR__');
14655 var startCase = createCompounder(function(result, word, index) {
14656 return result + (index ? ' ' : '') + upperFirst(word);
14660 * Checks if `string` starts with the given target string.
14666 * @param {string} [string=''] The string to inspect.
14667 * @param {string} [target] The string to search for.
14668 * @param {number} [position=0] The position to search from.
14669 * @returns {boolean} Returns `true` if `string` starts with `target`,
14673 * _.startsWith('abc', 'a');
14676 * _.startsWith('abc', 'b');
14679 * _.startsWith('abc', 'b', 1);
14682 function startsWith(string, target, position) {
14683 string = toString(string);
14684 position = position == null
14686 : baseClamp(toInteger(position), 0, string.length);
14688 target = baseToString(target);
14689 return string.slice(position, position + target.length) == target;
14693 * Creates a compiled template function that can interpolate data properties
14694 * in "interpolate" delimiters, HTML-escape interpolated data properties in
14695 * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data
14696 * properties may be accessed as free variables in the template. If a setting
14697 * object is given, it takes precedence over `_.templateSettings` values.
14699 * **Note:** In the development build `_.template` utilizes
14700 * [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl)
14701 * for easier debugging.
14703 * For more information on precompiling templates see
14704 * [lodash's custom builds documentation](https://lodash.com/custom-builds).
14706 * For more information on Chrome extension sandboxes see
14707 * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval).
14713 * @param {string} [string=''] The template string.
14714 * @param {Object} [options={}] The options object.
14715 * @param {RegExp} [options.escape=_.templateSettings.escape]
14716 * The HTML "escape" delimiter.
14717 * @param {RegExp} [options.evaluate=_.templateSettings.evaluate]
14718 * The "evaluate" delimiter.
14719 * @param {Object} [options.imports=_.templateSettings.imports]
14720 * An object to import into the template as free variables.
14721 * @param {RegExp} [options.interpolate=_.templateSettings.interpolate]
14722 * The "interpolate" delimiter.
14723 * @param {string} [options.sourceURL='lodash.templateSources[n]']
14724 * The sourceURL of the compiled template.
14725 * @param {string} [options.variable='obj']
14726 * The data object variable name.
14727 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
14728 * @returns {Function} Returns the compiled template function.
14731 * // Use the "interpolate" delimiter to create a compiled template.
14732 * var compiled = _.template('hello <%= user %>!');
14733 * compiled({ 'user': 'fred' });
14734 * // => 'hello fred!'
14736 * // Use the HTML "escape" delimiter to escape data property values.
14737 * var compiled = _.template('<b><%- value %></b>');
14738 * compiled({ 'value': '<script>' });
14739 * // => '<b><script></b>'
14741 * // Use the "evaluate" delimiter to execute JavaScript and generate HTML.
14742 * var compiled = _.template('<% _.forEach(users, function(user) { %><li><%- user %></li><% }); %>');
14743 * compiled({ 'users': ['fred', 'barney'] });
14744 * // => '<li>fred</li><li>barney</li>'
14746 * // Use the internal `print` function in "evaluate" delimiters.
14747 * var compiled = _.template('<% print("hello " + user); %>!');
14748 * compiled({ 'user': 'barney' });
14749 * // => 'hello barney!'
14751 * // Use the ES template literal delimiter as an "interpolate" delimiter.
14752 * // Disable support by replacing the "interpolate" delimiter.
14753 * var compiled = _.template('hello ${ user }!');
14754 * compiled({ 'user': 'pebbles' });
14755 * // => 'hello pebbles!'
14757 * // Use backslashes to treat delimiters as plain text.
14758 * var compiled = _.template('<%= "\\<%- value %\\>" %>');
14759 * compiled({ 'value': 'ignored' });
14760 * // => '<%- value %>'
14762 * // Use the `imports` option to import `jQuery` as `jq`.
14763 * var text = '<% jq.each(users, function(user) { %><li><%- user %></li><% }); %>';
14764 * var compiled = _.template(text, { 'imports': { 'jq': jQuery } });
14765 * compiled({ 'users': ['fred', 'barney'] });
14766 * // => '<li>fred</li><li>barney</li>'
14768 * // Use the `sourceURL` option to specify a custom sourceURL for the template.
14769 * var compiled = _.template('hello <%= user %>!', { 'sourceURL': '/basic/greeting.jst' });
14771 * // => Find the source of "greeting.jst" under the Sources tab or Resources panel of the web inspector.
14773 * // Use the `variable` option to ensure a with-statement isn't used in the compiled template.
14774 * var compiled = _.template('hi <%= data.user %>!', { 'variable': 'data' });
14776 * // => function(data) {
14777 * // var __t, __p = '';
14778 * // __p += 'hi ' + ((__t = ( data.user )) == null ? '' : __t) + '!';
14782 * // Use custom template delimiters.
14783 * _.templateSettings.interpolate = /{{([\s\S]+?)}}/g;
14784 * var compiled = _.template('hello {{ user }}!');
14785 * compiled({ 'user': 'mustache' });
14786 * // => 'hello mustache!'
14788 * // Use the `source` property to inline compiled templates for meaningful
14789 * // line numbers in error messages and stack traces.
14790 * fs.writeFileSync(path.join(process.cwd(), 'jst.js'), '\
14792 * "main": ' + _.template(mainText).source + '\
14796 function template(string, options, guard) {
14797 // Based on John Resig's `tmpl` implementation
14798 // (http://ejohn.org/blog/javascript-micro-templating/)
14799 // and Laura Doktorova's doT.js (https://github.com/olado/doT).
14800 var settings = lodash.templateSettings;
14802 if (guard && isIterateeCall(string, options, guard)) {
14803 options = undefined;
14805 string = toString(string);
14806 options = assignInWith({}, options, settings, customDefaultsAssignIn);
14808 var imports = assignInWith({}, options.imports, settings.imports, customDefaultsAssignIn),
14809 importsKeys = keys(imports),
14810 importsValues = baseValues(imports, importsKeys);
14815 interpolate = options.interpolate || reNoMatch,
14816 source = "__p += '";
14818 // Compile the regexp to match each delimiter.
14819 var reDelimiters = RegExp(
14820 (options.escape || reNoMatch).source + '|' +
14821 interpolate.source + '|' +
14822 (interpolate === reInterpolate ? reEsTemplate : reNoMatch).source + '|' +
14823 (options.evaluate || reNoMatch).source + '|$'
14826 // Use a sourceURL for easier debugging.
14827 // The sourceURL gets injected into the source that's eval-ed, so be careful
14828 // to normalize all kinds of whitespace, so e.g. newlines (and unicode versions of it) can't sneak in
14829 // and escape the comment, thus injecting code that gets evaled.
14830 var sourceURL = '//# sourceURL=' +
14831 (hasOwnProperty.call(options, 'sourceURL')
14832 ? (options.sourceURL + '').replace(/\s/g, ' ')
14833 : ('lodash.templateSources[' + (++templateCounter) + ']')
14836 string.replace(reDelimiters, function(match, escapeValue, interpolateValue, esTemplateValue, evaluateValue, offset) {
14837 interpolateValue || (interpolateValue = esTemplateValue);
14839 // Escape characters that can't be included in string literals.
14840 source += string.slice(index, offset).replace(reUnescapedString, escapeStringChar);
14842 // Replace delimiters with snippets.
14845 source += "' +\n__e(" + escapeValue + ") +\n'";
14847 if (evaluateValue) {
14848 isEvaluating = true;
14849 source += "';\n" + evaluateValue + ";\n__p += '";
14851 if (interpolateValue) {
14852 source += "' +\n((__t = (" + interpolateValue + ")) == null ? '' : __t) +\n'";
14854 index = offset + match.length;
14856 // The JS engine embedded in Adobe products needs `match` returned in
14857 // order to produce the correct `offset` value.
14863 // If `variable` is not specified wrap a with-statement around the generated
14864 // code to add the data object to the top of the scope chain.
14865 var variable = hasOwnProperty.call(options, 'variable') && options.variable;
14867 source = 'with (obj) {\n' + source + '\n}\n';
14869 // Cleanup code by stripping empty strings.
14870 source = (isEvaluating ? source.replace(reEmptyStringLeading, '') : source)
14871 .replace(reEmptyStringMiddle, '$1')
14872 .replace(reEmptyStringTrailing, '$1;');
14874 // Frame code as the function body.
14875 source = 'function(' + (variable || 'obj') + ') {\n' +
14878 : 'obj || (obj = {});\n'
14880 "var __t, __p = ''" +
14882 ? ', __e = _.escape'
14886 ? ', __j = Array.prototype.join;\n' +
14887 "function print() { __p += __j.call(arguments, '') }\n"
14893 var result = attempt(function() {
14894 return Function(importsKeys, sourceURL + 'return ' + source)
14895 .apply(undefined, importsValues);
14898 // Provide the compiled function's source by its `toString` method or
14899 // the `source` property as a convenience for inlining compiled templates.
14900 result.source = source;
14901 if (isError(result)) {
14908 * Converts `string`, as a whole, to lower case just like
14909 * [String#toLowerCase](https://mdn.io/toLowerCase).
14915 * @param {string} [string=''] The string to convert.
14916 * @returns {string} Returns the lower cased string.
14919 * _.toLower('--Foo-Bar--');
14920 * // => '--foo-bar--'
14922 * _.toLower('fooBar');
14925 * _.toLower('__FOO_BAR__');
14926 * // => '__foo_bar__'
14928 function toLower(value) {
14929 return toString(value).toLowerCase();
14933 * Converts `string`, as a whole, to upper case just like
14934 * [String#toUpperCase](https://mdn.io/toUpperCase).
14940 * @param {string} [string=''] The string to convert.
14941 * @returns {string} Returns the upper cased string.
14944 * _.toUpper('--foo-bar--');
14945 * // => '--FOO-BAR--'
14947 * _.toUpper('fooBar');
14950 * _.toUpper('__foo_bar__');
14951 * // => '__FOO_BAR__'
14953 function toUpper(value) {
14954 return toString(value).toUpperCase();
14958 * Removes leading and trailing whitespace or specified characters from `string`.
14964 * @param {string} [string=''] The string to trim.
14965 * @param {string} [chars=whitespace] The characters to trim.
14966 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
14967 * @returns {string} Returns the trimmed string.
14973 * _.trim('-_-abc-_-', '_-');
14976 * _.map([' foo ', ' bar '], _.trim);
14977 * // => ['foo', 'bar']
14979 function trim(string, chars, guard) {
14980 string = toString(string);
14981 if (string && (guard || chars === undefined)) {
14982 return string.replace(reTrim, '');
14984 if (!string || !(chars = baseToString(chars))) {
14987 var strSymbols = stringToArray(string),
14988 chrSymbols = stringToArray(chars),
14989 start = charsStartIndex(strSymbols, chrSymbols),
14990 end = charsEndIndex(strSymbols, chrSymbols) + 1;
14992 return castSlice(strSymbols, start, end).join('');
14996 * Removes trailing whitespace or specified characters from `string`.
15002 * @param {string} [string=''] The string to trim.
15003 * @param {string} [chars=whitespace] The characters to trim.
15004 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
15005 * @returns {string} Returns the trimmed string.
15008 * _.trimEnd(' abc ');
15011 * _.trimEnd('-_-abc-_-', '_-');
15014 function trimEnd(string, chars, guard) {
15015 string = toString(string);
15016 if (string && (guard || chars === undefined)) {
15017 return string.replace(reTrimEnd, '');
15019 if (!string || !(chars = baseToString(chars))) {
15022 var strSymbols = stringToArray(string),
15023 end = charsEndIndex(strSymbols, stringToArray(chars)) + 1;
15025 return castSlice(strSymbols, 0, end).join('');
15029 * Removes leading whitespace or specified characters from `string`.
15035 * @param {string} [string=''] The string to trim.
15036 * @param {string} [chars=whitespace] The characters to trim.
15037 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
15038 * @returns {string} Returns the trimmed string.
15041 * _.trimStart(' abc ');
15044 * _.trimStart('-_-abc-_-', '_-');
15047 function trimStart(string, chars, guard) {
15048 string = toString(string);
15049 if (string && (guard || chars === undefined)) {
15050 return string.replace(reTrimStart, '');
15052 if (!string || !(chars = baseToString(chars))) {
15055 var strSymbols = stringToArray(string),
15056 start = charsStartIndex(strSymbols, stringToArray(chars));
15058 return castSlice(strSymbols, start).join('');
15062 * Truncates `string` if it's longer than the given maximum string length.
15063 * The last characters of the truncated string are replaced with the omission
15064 * string which defaults to "...".
15070 * @param {string} [string=''] The string to truncate.
15071 * @param {Object} [options={}] The options object.
15072 * @param {number} [options.length=30] The maximum string length.
15073 * @param {string} [options.omission='...'] The string to indicate text is omitted.
15074 * @param {RegExp|string} [options.separator] The separator pattern to truncate to.
15075 * @returns {string} Returns the truncated string.
15078 * _.truncate('hi-diddly-ho there, neighborino');
15079 * // => 'hi-diddly-ho there, neighbo...'
15081 * _.truncate('hi-diddly-ho there, neighborino', {
15085 * // => 'hi-diddly-ho there,...'
15087 * _.truncate('hi-diddly-ho there, neighborino', {
15089 * 'separator': /,? +/
15091 * // => 'hi-diddly-ho there...'
15093 * _.truncate('hi-diddly-ho there, neighborino', {
15094 * 'omission': ' [...]'
15096 * // => 'hi-diddly-ho there, neig [...]'
15098 function truncate(string, options) {
15099 var length = DEFAULT_TRUNC_LENGTH,
15100 omission = DEFAULT_TRUNC_OMISSION;
15102 if (isObject(options)) {
15103 var separator = 'separator' in options ? options.separator : separator;
15104 length = 'length' in options ? toInteger(options.length) : length;
15105 omission = 'omission' in options ? baseToString(options.omission) : omission;
15107 string = toString(string);
15109 var strLength = string.length;
15110 if (hasUnicode(string)) {
15111 var strSymbols = stringToArray(string);
15112 strLength = strSymbols.length;
15114 if (length >= strLength) {
15117 var end = length - stringSize(omission);
15121 var result = strSymbols
15122 ? castSlice(strSymbols, 0, end).join('')
15123 : string.slice(0, end);
15125 if (separator === undefined) {
15126 return result + omission;
15129 end += (result.length - end);
15131 if (isRegExp(separator)) {
15132 if (string.slice(end).search(separator)) {
15134 substring = result;
15136 if (!separator.global) {
15137 separator = RegExp(separator.source, toString(reFlags.exec(separator)) + 'g');
15139 separator.lastIndex = 0;
15140 while ((match = separator.exec(substring))) {
15141 var newEnd = match.index;
15143 result = result.slice(0, newEnd === undefined ? end : newEnd);
15145 } else if (string.indexOf(baseToString(separator), end) != end) {
15146 var index = result.lastIndexOf(separator);
15148 result = result.slice(0, index);
15151 return result + omission;
15155 * The inverse of `_.escape`; this method converts the HTML entities
15156 * `&`, `<`, `>`, `"`, and `'` in `string` to
15157 * their corresponding characters.
15159 * **Note:** No other HTML entities are unescaped. To unescape additional
15160 * HTML entities use a third-party library like [_he_](https://mths.be/he).
15166 * @param {string} [string=''] The string to unescape.
15167 * @returns {string} Returns the unescaped string.
15170 * _.unescape('fred, barney, & pebbles');
15171 * // => 'fred, barney, & pebbles'
15173 function unescape(string) {
15174 string = toString(string);
15175 return (string && reHasEscapedHtml.test(string))
15176 ? string.replace(reEscapedHtml, unescapeHtmlChar)
15181 * Converts `string`, as space separated words, to upper case.
15187 * @param {string} [string=''] The string to convert.
15188 * @returns {string} Returns the upper cased string.
15191 * _.upperCase('--foo-bar');
15194 * _.upperCase('fooBar');
15197 * _.upperCase('__foo_bar__');
15200 var upperCase = createCompounder(function(result, word, index) {
15201 return result + (index ? ' ' : '') + word.toUpperCase();
15205 * Converts the first character of `string` to upper case.
15211 * @param {string} [string=''] The string to convert.
15212 * @returns {string} Returns the converted string.
15215 * _.upperFirst('fred');
15218 * _.upperFirst('FRED');
15221 var upperFirst = createCaseFirst('toUpperCase');
15224 * Splits `string` into an array of its words.
15230 * @param {string} [string=''] The string to inspect.
15231 * @param {RegExp|string} [pattern] The pattern to match words.
15232 * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
15233 * @returns {Array} Returns the words of `string`.
15236 * _.words('fred, barney, & pebbles');
15237 * // => ['fred', 'barney', 'pebbles']
15239 * _.words('fred, barney, & pebbles', /[^, ]+/g);
15240 * // => ['fred', 'barney', '&', 'pebbles']
15242 function words(string, pattern, guard) {
15243 string = toString(string);
15244 pattern = guard ? undefined : pattern;
15246 if (pattern === undefined) {
15247 return hasUnicodeWord(string) ? unicodeWords(string) : asciiWords(string);
15249 return string.match(pattern) || [];
15252 /*------------------------------------------------------------------------*/
15255 * Attempts to invoke `func`, returning either the result or the caught error
15256 * object. Any additional arguments are provided to `func` when it's invoked.
15262 * @param {Function} func The function to attempt.
15263 * @param {...*} [args] The arguments to invoke `func` with.
15264 * @returns {*} Returns the `func` result or error object.
15267 * // Avoid throwing errors for invalid selectors.
15268 * var elements = _.attempt(function(selector) {
15269 * return document.querySelectorAll(selector);
15272 * if (_.isError(elements)) {
15276 var attempt = baseRest(function(func, args) {
15278 return apply(func, undefined, args);
15280 return isError(e) ? e : new Error(e);
15285 * Binds methods of an object to the object itself, overwriting the existing
15288 * **Note:** This method doesn't set the "length" property of bound functions.
15294 * @param {Object} object The object to bind and assign the bound methods to.
15295 * @param {...(string|string[])} methodNames The object method names to bind.
15296 * @returns {Object} Returns `object`.
15301 * 'click': function() {
15302 * console.log('clicked ' + this.label);
15306 * _.bindAll(view, ['click']);
15307 * jQuery(element).on('click', view.click);
15308 * // => Logs 'clicked docs' when clicked.
15310 var bindAll = flatRest(function(object, methodNames) {
15311 arrayEach(methodNames, function(key) {
15313 baseAssignValue(object, key, bind(object[key], object));
15319 * Creates a function that iterates over `pairs` and invokes the corresponding
15320 * function of the first predicate to return truthy. The predicate-function
15321 * pairs are invoked with the `this` binding and arguments of the created
15328 * @param {Array} pairs The predicate-function pairs.
15329 * @returns {Function} Returns the new composite function.
15332 * var func = _.cond([
15333 * [_.matches({ 'a': 1 }), _.constant('matches A')],
15334 * [_.conforms({ 'b': _.isNumber }), _.constant('matches B')],
15335 * [_.stubTrue, _.constant('no match')]
15338 * func({ 'a': 1, 'b': 2 });
15339 * // => 'matches A'
15341 * func({ 'a': 0, 'b': 1 });
15342 * // => 'matches B'
15344 * func({ 'a': '1', 'b': '2' });
15347 function cond(pairs) {
15348 var length = pairs == null ? 0 : pairs.length,
15349 toIteratee = getIteratee();
15351 pairs = !length ? [] : arrayMap(pairs, function(pair) {
15352 if (typeof pair[1] != 'function') {
15353 throw new TypeError(FUNC_ERROR_TEXT);
15355 return [toIteratee(pair[0]), pair[1]];
15358 return baseRest(function(args) {
15360 while (++index < length) {
15361 var pair = pairs[index];
15362 if (apply(pair[0], this, args)) {
15363 return apply(pair[1], this, args);
15370 * Creates a function that invokes the predicate properties of `source` with
15371 * the corresponding property values of a given object, returning `true` if
15372 * all predicates return truthy, else `false`.
15374 * **Note:** The created function is equivalent to `_.conformsTo` with
15375 * `source` partially applied.
15381 * @param {Object} source The object of property predicates to conform to.
15382 * @returns {Function} Returns the new spec function.
15386 * { 'a': 2, 'b': 1 },
15387 * { 'a': 1, 'b': 2 }
15390 * _.filter(objects, _.conforms({ 'b': function(n) { return n > 1; } }));
15391 * // => [{ 'a': 1, 'b': 2 }]
15393 function conforms(source) {
15394 return baseConforms(baseClone(source, CLONE_DEEP_FLAG));
15398 * Creates a function that returns `value`.
15404 * @param {*} value The value to return from the new function.
15405 * @returns {Function} Returns the new constant function.
15408 * var objects = _.times(2, _.constant({ 'a': 1 }));
15410 * console.log(objects);
15411 * // => [{ 'a': 1 }, { 'a': 1 }]
15413 * console.log(objects[0] === objects[1]);
15416 function constant(value) {
15417 return function() {
15423 * Checks `value` to determine whether a default value should be returned in
15424 * its place. The `defaultValue` is returned if `value` is `NaN`, `null`,
15431 * @param {*} value The value to check.
15432 * @param {*} defaultValue The default value.
15433 * @returns {*} Returns the resolved value.
15436 * _.defaultTo(1, 10);
15439 * _.defaultTo(undefined, 10);
15442 function defaultTo(value, defaultValue) {
15443 return (value == null || value !== value) ? defaultValue : value;
15447 * Creates a function that returns the result of invoking the given functions
15448 * with the `this` binding of the created function, where each successive
15449 * invocation is supplied the return value of the previous.
15455 * @param {...(Function|Function[])} [funcs] The functions to invoke.
15456 * @returns {Function} Returns the new composite function.
15460 * function square(n) {
15464 * var addSquare = _.flow([_.add, square]);
15468 var flow = createFlow();
15471 * This method is like `_.flow` except that it creates a function that
15472 * invokes the given functions from right to left.
15478 * @param {...(Function|Function[])} [funcs] The functions to invoke.
15479 * @returns {Function} Returns the new composite function.
15483 * function square(n) {
15487 * var addSquare = _.flowRight([square, _.add]);
15491 var flowRight = createFlow(true);
15494 * This method returns the first argument it receives.
15500 * @param {*} value Any value.
15501 * @returns {*} Returns `value`.
15504 * var object = { 'a': 1 };
15506 * console.log(_.identity(object) === object);
15509 function identity(value) {
15514 * Creates a function that invokes `func` with the arguments of the created
15515 * function. If `func` is a property name, the created function returns the
15516 * property value for a given element. If `func` is an array or object, the
15517 * created function returns `true` for elements that contain the equivalent
15518 * source properties, otherwise it returns `false`.
15524 * @param {*} [func=_.identity] The value to convert to a callback.
15525 * @returns {Function} Returns the callback.
15529 * { 'user': 'barney', 'age': 36, 'active': true },
15530 * { 'user': 'fred', 'age': 40, 'active': false }
15533 * // The `_.matches` iteratee shorthand.
15534 * _.filter(users, _.iteratee({ 'user': 'barney', 'active': true }));
15535 * // => [{ 'user': 'barney', 'age': 36, 'active': true }]
15537 * // The `_.matchesProperty` iteratee shorthand.
15538 * _.filter(users, _.iteratee(['user', 'fred']));
15539 * // => [{ 'user': 'fred', 'age': 40 }]
15541 * // The `_.property` iteratee shorthand.
15542 * _.map(users, _.iteratee('user'));
15543 * // => ['barney', 'fred']
15545 * // Create custom iteratee shorthands.
15546 * _.iteratee = _.wrap(_.iteratee, function(iteratee, func) {
15547 * return !_.isRegExp(func) ? iteratee(func) : function(string) {
15548 * return func.test(string);
15552 * _.filter(['abc', 'def'], /ef/);
15555 function iteratee(func) {
15556 return baseIteratee(typeof func == 'function' ? func : baseClone(func, CLONE_DEEP_FLAG));
15560 * Creates a function that performs a partial deep comparison between a given
15561 * object and `source`, returning `true` if the given object has equivalent
15562 * property values, else `false`.
15564 * **Note:** The created function is equivalent to `_.isMatch` with `source`
15565 * partially applied.
15567 * Partial comparisons will match empty array and empty object `source`
15568 * values against any array or object value, respectively. See `_.isEqual`
15569 * for a list of supported value comparisons.
15571 * **Note:** Multiple values can be checked by combining several matchers
15572 * using `_.overSome`
15578 * @param {Object} source The object of property values to match.
15579 * @returns {Function} Returns the new spec function.
15583 * { 'a': 1, 'b': 2, 'c': 3 },
15584 * { 'a': 4, 'b': 5, 'c': 6 }
15587 * _.filter(objects, _.matches({ 'a': 4, 'c': 6 }));
15588 * // => [{ 'a': 4, 'b': 5, 'c': 6 }]
15590 * // Checking for several possible values
15591 * _.filter(objects, _.overSome([_.matches({ 'a': 1 }), _.matches({ 'a': 4 })]));
15592 * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
15594 function matches(source) {
15595 return baseMatches(baseClone(source, CLONE_DEEP_FLAG));
15599 * Creates a function that performs a partial deep comparison between the
15600 * value at `path` of a given object to `srcValue`, returning `true` if the
15601 * object value is equivalent, else `false`.
15603 * **Note:** Partial comparisons will match empty array and empty object
15604 * `srcValue` values against any array or object value, respectively. See
15605 * `_.isEqual` for a list of supported value comparisons.
15607 * **Note:** Multiple values can be checked by combining several matchers
15608 * using `_.overSome`
15614 * @param {Array|string} path The path of the property to get.
15615 * @param {*} srcValue The value to match.
15616 * @returns {Function} Returns the new spec function.
15620 * { 'a': 1, 'b': 2, 'c': 3 },
15621 * { 'a': 4, 'b': 5, 'c': 6 }
15624 * _.find(objects, _.matchesProperty('a', 4));
15625 * // => { 'a': 4, 'b': 5, 'c': 6 }
15627 * // Checking for several possible values
15628 * _.filter(objects, _.overSome([_.matchesProperty('a', 1), _.matchesProperty('a', 4)]));
15629 * // => [{ 'a': 1, 'b': 2, 'c': 3 }, { 'a': 4, 'b': 5, 'c': 6 }]
15631 function matchesProperty(path, srcValue) {
15632 return baseMatchesProperty(path, baseClone(srcValue, CLONE_DEEP_FLAG));
15636 * Creates a function that invokes the method at `path` of a given object.
15637 * Any additional arguments are provided to the invoked method.
15643 * @param {Array|string} path The path of the method to invoke.
15644 * @param {...*} [args] The arguments to invoke the method with.
15645 * @returns {Function} Returns the new invoker function.
15649 * { 'a': { 'b': _.constant(2) } },
15650 * { 'a': { 'b': _.constant(1) } }
15653 * _.map(objects, _.method('a.b'));
15656 * _.map(objects, _.method(['a', 'b']));
15659 var method = baseRest(function(path, args) {
15660 return function(object) {
15661 return baseInvoke(object, path, args);
15666 * The opposite of `_.method`; this method creates a function that invokes
15667 * the method at a given path of `object`. Any additional arguments are
15668 * provided to the invoked method.
15674 * @param {Object} object The object to query.
15675 * @param {...*} [args] The arguments to invoke the method with.
15676 * @returns {Function} Returns the new invoker function.
15679 * var array = _.times(3, _.constant),
15680 * object = { 'a': array, 'b': array, 'c': array };
15682 * _.map(['a[2]', 'c[0]'], _.methodOf(object));
15685 * _.map([['a', '2'], ['c', '0']], _.methodOf(object));
15688 var methodOf = baseRest(function(object, args) {
15689 return function(path) {
15690 return baseInvoke(object, path, args);
15695 * Adds all own enumerable string keyed function properties of a source
15696 * object to the destination object. If `object` is a function, then methods
15697 * are added to its prototype as well.
15699 * **Note:** Use `_.runInContext` to create a pristine `lodash` function to
15700 * avoid conflicts caused by modifying the original.
15706 * @param {Function|Object} [object=lodash] The destination object.
15707 * @param {Object} source The object of functions to add.
15708 * @param {Object} [options={}] The options object.
15709 * @param {boolean} [options.chain=true] Specify whether mixins are chainable.
15710 * @returns {Function|Object} Returns `object`.
15713 * function vowels(string) {
15714 * return _.filter(string, function(v) {
15715 * return /[aeiou]/i.test(v);
15719 * _.mixin({ 'vowels': vowels });
15720 * _.vowels('fred');
15723 * _('fred').vowels().value();
15726 * _.mixin({ 'vowels': vowels }, { 'chain': false });
15727 * _('fred').vowels();
15730 function mixin(object, source, options) {
15731 var props = keys(source),
15732 methodNames = baseFunctions(source, props);
15734 if (options == null &&
15735 !(isObject(source) && (methodNames.length || !props.length))) {
15739 methodNames = baseFunctions(source, keys(source));
15741 var chain = !(isObject(options) && 'chain' in options) || !!options.chain,
15742 isFunc = isFunction(object);
15744 arrayEach(methodNames, function(methodName) {
15745 var func = source[methodName];
15746 object[methodName] = func;
15748 object.prototype[methodName] = function() {
15749 var chainAll = this.__chain__;
15750 if (chain || chainAll) {
15751 var result = object(this.__wrapped__),
15752 actions = result.__actions__ = copyArray(this.__actions__);
15754 actions.push({ 'func': func, 'args': arguments, 'thisArg': object });
15755 result.__chain__ = chainAll;
15758 return func.apply(object, arrayPush([this.value()], arguments));
15767 * Reverts the `_` variable to its previous value and returns a reference to
15768 * the `lodash` function.
15774 * @returns {Function} Returns the `lodash` function.
15777 * var lodash = _.noConflict();
15779 function noConflict() {
15780 if (root._ === this) {
15787 * This method returns `undefined`.
15795 * _.times(2, _.noop);
15796 * // => [undefined, undefined]
15799 // No operation performed.
15803 * Creates a function that gets the argument at index `n`. If `n` is negative,
15804 * the nth argument from the end is returned.
15810 * @param {number} [n=0] The index of the argument to return.
15811 * @returns {Function} Returns the new pass-thru function.
15814 * var func = _.nthArg(1);
15815 * func('a', 'b', 'c', 'd');
15818 * var func = _.nthArg(-2);
15819 * func('a', 'b', 'c', 'd');
15822 function nthArg(n) {
15824 return baseRest(function(args) {
15825 return baseNth(args, n);
15830 * Creates a function that invokes `iteratees` with the arguments it receives
15831 * and returns their results.
15837 * @param {...(Function|Function[])} [iteratees=[_.identity]]
15838 * The iteratees to invoke.
15839 * @returns {Function} Returns the new function.
15842 * var func = _.over([Math.max, Math.min]);
15844 * func(1, 2, 3, 4);
15847 var over = createOver(arrayMap);
15850 * Creates a function that checks if **all** of the `predicates` return
15851 * truthy when invoked with the arguments it receives.
15853 * Following shorthands are possible for providing predicates.
15854 * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
15855 * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
15861 * @param {...(Function|Function[])} [predicates=[_.identity]]
15862 * The predicates to check.
15863 * @returns {Function} Returns the new function.
15866 * var func = _.overEvery([Boolean, isFinite]);
15877 var overEvery = createOver(arrayEvery);
15880 * Creates a function that checks if **any** of the `predicates` return
15881 * truthy when invoked with the arguments it receives.
15883 * Following shorthands are possible for providing predicates.
15884 * Pass an `Object` and it will be used as an parameter for `_.matches` to create the predicate.
15885 * Pass an `Array` of parameters for `_.matchesProperty` and the predicate will be created using them.
15891 * @param {...(Function|Function[])} [predicates=[_.identity]]
15892 * The predicates to check.
15893 * @returns {Function} Returns the new function.
15896 * var func = _.overSome([Boolean, isFinite]);
15907 * var matchesFunc = _.overSome([{ 'a': 1 }, { 'a': 2 }])
15908 * var matchesPropertyFunc = _.overSome([['a', 1], ['a', 2]])
15910 var overSome = createOver(arraySome);
15913 * Creates a function that returns the value at `path` of a given object.
15919 * @param {Array|string} path The path of the property to get.
15920 * @returns {Function} Returns the new accessor function.
15924 * { 'a': { 'b': 2 } },
15925 * { 'a': { 'b': 1 } }
15928 * _.map(objects, _.property('a.b'));
15931 * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');
15934 function property(path) {
15935 return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);
15939 * The opposite of `_.property`; this method creates a function that returns
15940 * the value at a given path of `object`.
15946 * @param {Object} object The object to query.
15947 * @returns {Function} Returns the new accessor function.
15950 * var array = [0, 1, 2],
15951 * object = { 'a': array, 'b': array, 'c': array };
15953 * _.map(['a[2]', 'c[0]'], _.propertyOf(object));
15956 * _.map([['a', '2'], ['c', '0']], _.propertyOf(object));
15959 function propertyOf(object) {
15960 return function(path) {
15961 return object == null ? undefined : baseGet(object, path);
15966 * Creates an array of numbers (positive and/or negative) progressing from
15967 * `start` up to, but not including, `end`. A step of `-1` is used if a negative
15968 * `start` is specified without an `end` or `step`. If `end` is not specified,
15969 * it's set to `start` with `start` then set to `0`.
15971 * **Note:** JavaScript follows the IEEE-754 standard for resolving
15972 * floating-point values which can produce unexpected results.
15978 * @param {number} [start=0] The start of the range.
15979 * @param {number} end The end of the range.
15980 * @param {number} [step=1] The value to increment or decrement by.
15981 * @returns {Array} Returns the range of numbers.
15982 * @see _.inRange, _.rangeRight
15986 * // => [0, 1, 2, 3]
15989 * // => [0, -1, -2, -3]
15992 * // => [1, 2, 3, 4]
15994 * _.range(0, 20, 5);
15995 * // => [0, 5, 10, 15]
15997 * _.range(0, -4, -1);
15998 * // => [0, -1, -2, -3]
16000 * _.range(1, 4, 0);
16006 var range = createRange();
16009 * This method is like `_.range` except that it populates values in
16010 * descending order.
16016 * @param {number} [start=0] The start of the range.
16017 * @param {number} end The end of the range.
16018 * @param {number} [step=1] The value to increment or decrement by.
16019 * @returns {Array} Returns the range of numbers.
16020 * @see _.inRange, _.range
16024 * // => [3, 2, 1, 0]
16026 * _.rangeRight(-4);
16027 * // => [-3, -2, -1, 0]
16029 * _.rangeRight(1, 5);
16030 * // => [4, 3, 2, 1]
16032 * _.rangeRight(0, 20, 5);
16033 * // => [15, 10, 5, 0]
16035 * _.rangeRight(0, -4, -1);
16036 * // => [-3, -2, -1, 0]
16038 * _.rangeRight(1, 4, 0);
16044 var rangeRight = createRange(true);
16047 * This method returns a new empty array.
16053 * @returns {Array} Returns the new empty array.
16056 * var arrays = _.times(2, _.stubArray);
16058 * console.log(arrays);
16061 * console.log(arrays[0] === arrays[1]);
16064 function stubArray() {
16069 * This method returns `false`.
16075 * @returns {boolean} Returns `false`.
16078 * _.times(2, _.stubFalse);
16079 * // => [false, false]
16081 function stubFalse() {
16086 * This method returns a new empty object.
16092 * @returns {Object} Returns the new empty object.
16095 * var objects = _.times(2, _.stubObject);
16097 * console.log(objects);
16100 * console.log(objects[0] === objects[1]);
16103 function stubObject() {
16108 * This method returns an empty string.
16114 * @returns {string} Returns the empty string.
16117 * _.times(2, _.stubString);
16120 function stubString() {
16125 * This method returns `true`.
16131 * @returns {boolean} Returns `true`.
16134 * _.times(2, _.stubTrue);
16135 * // => [true, true]
16137 function stubTrue() {
16142 * Invokes the iteratee `n` times, returning an array of the results of
16143 * each invocation. The iteratee is invoked with one argument; (index).
16149 * @param {number} n The number of times to invoke `iteratee`.
16150 * @param {Function} [iteratee=_.identity] The function invoked per iteration.
16151 * @returns {Array} Returns the array of results.
16154 * _.times(3, String);
16155 * // => ['0', '1', '2']
16157 * _.times(4, _.constant(0));
16158 * // => [0, 0, 0, 0]
16160 function times(n, iteratee) {
16162 if (n < 1 || n > MAX_SAFE_INTEGER) {
16165 var index = MAX_ARRAY_LENGTH,
16166 length = nativeMin(n, MAX_ARRAY_LENGTH);
16168 iteratee = getIteratee(iteratee);
16169 n -= MAX_ARRAY_LENGTH;
16171 var result = baseTimes(length, iteratee);
16172 while (++index < n) {
16179 * Converts `value` to a property path array.
16185 * @param {*} value The value to convert.
16186 * @returns {Array} Returns the new property path array.
16189 * _.toPath('a.b.c');
16190 * // => ['a', 'b', 'c']
16192 * _.toPath('a[0].b.c');
16193 * // => ['a', '0', 'b', 'c']
16195 function toPath(value) {
16196 if (isArray(value)) {
16197 return arrayMap(value, toKey);
16199 return isSymbol(value) ? [value] : copyArray(stringToPath(toString(value)));
16203 * Generates a unique ID. If `prefix` is given, the ID is appended to it.
16209 * @param {string} [prefix=''] The value to prefix the ID with.
16210 * @returns {string} Returns the unique ID.
16213 * _.uniqueId('contact_');
16214 * // => 'contact_104'
16219 function uniqueId(prefix) {
16220 var id = ++idCounter;
16221 return toString(prefix) + id;
16224 /*------------------------------------------------------------------------*/
16227 * Adds two numbers.
16233 * @param {number} augend The first number in an addition.
16234 * @param {number} addend The second number in an addition.
16235 * @returns {number} Returns the total.
16241 var add = createMathOperation(function(augend, addend) {
16242 return augend + addend;
16246 * Computes `number` rounded up to `precision`.
16252 * @param {number} number The number to round up.
16253 * @param {number} [precision=0] The precision to round up to.
16254 * @returns {number} Returns the rounded up number.
16260 * _.ceil(6.004, 2);
16263 * _.ceil(6040, -2);
16266 var ceil = createRound('ceil');
16269 * Divide two numbers.
16275 * @param {number} dividend The first number in a division.
16276 * @param {number} divisor The second number in a division.
16277 * @returns {number} Returns the quotient.
16283 var divide = createMathOperation(function(dividend, divisor) {
16284 return dividend / divisor;
16288 * Computes `number` rounded down to `precision`.
16294 * @param {number} number The number to round down.
16295 * @param {number} [precision=0] The precision to round down to.
16296 * @returns {number} Returns the rounded down number.
16302 * _.floor(0.046, 2);
16305 * _.floor(4060, -2);
16308 var floor = createRound('floor');
16311 * Computes the maximum value of `array`. If `array` is empty or falsey,
16312 * `undefined` is returned.
16318 * @param {Array} array The array to iterate over.
16319 * @returns {*} Returns the maximum value.
16322 * _.max([4, 2, 8, 6]);
16328 function max(array) {
16329 return (array && array.length)
16330 ? baseExtremum(array, identity, baseGt)
16335 * This method is like `_.max` except that it accepts `iteratee` which is
16336 * invoked for each element in `array` to generate the criterion by which
16337 * the value is ranked. The iteratee is invoked with one argument: (value).
16343 * @param {Array} array The array to iterate over.
16344 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
16345 * @returns {*} Returns the maximum value.
16348 * var objects = [{ 'n': 1 }, { 'n': 2 }];
16350 * _.maxBy(objects, function(o) { return o.n; });
16353 * // The `_.property` iteratee shorthand.
16354 * _.maxBy(objects, 'n');
16357 function maxBy(array, iteratee) {
16358 return (array && array.length)
16359 ? baseExtremum(array, getIteratee(iteratee, 2), baseGt)
16364 * Computes the mean of the values in `array`.
16370 * @param {Array} array The array to iterate over.
16371 * @returns {number} Returns the mean.
16374 * _.mean([4, 2, 8, 6]);
16377 function mean(array) {
16378 return baseMean(array, identity);
16382 * This method is like `_.mean` except that it accepts `iteratee` which is
16383 * invoked for each element in `array` to generate the value to be averaged.
16384 * The iteratee is invoked with one argument: (value).
16390 * @param {Array} array The array to iterate over.
16391 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
16392 * @returns {number} Returns the mean.
16395 * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
16397 * _.meanBy(objects, function(o) { return o.n; });
16400 * // The `_.property` iteratee shorthand.
16401 * _.meanBy(objects, 'n');
16404 function meanBy(array, iteratee) {
16405 return baseMean(array, getIteratee(iteratee, 2));
16409 * Computes the minimum value of `array`. If `array` is empty or falsey,
16410 * `undefined` is returned.
16416 * @param {Array} array The array to iterate over.
16417 * @returns {*} Returns the minimum value.
16420 * _.min([4, 2, 8, 6]);
16426 function min(array) {
16427 return (array && array.length)
16428 ? baseExtremum(array, identity, baseLt)
16433 * This method is like `_.min` except that it accepts `iteratee` which is
16434 * invoked for each element in `array` to generate the criterion by which
16435 * the value is ranked. The iteratee is invoked with one argument: (value).
16441 * @param {Array} array The array to iterate over.
16442 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
16443 * @returns {*} Returns the minimum value.
16446 * var objects = [{ 'n': 1 }, { 'n': 2 }];
16448 * _.minBy(objects, function(o) { return o.n; });
16451 * // The `_.property` iteratee shorthand.
16452 * _.minBy(objects, 'n');
16455 function minBy(array, iteratee) {
16456 return (array && array.length)
16457 ? baseExtremum(array, getIteratee(iteratee, 2), baseLt)
16462 * Multiply two numbers.
16468 * @param {number} multiplier The first number in a multiplication.
16469 * @param {number} multiplicand The second number in a multiplication.
16470 * @returns {number} Returns the product.
16473 * _.multiply(6, 4);
16476 var multiply = createMathOperation(function(multiplier, multiplicand) {
16477 return multiplier * multiplicand;
16481 * Computes `number` rounded to `precision`.
16487 * @param {number} number The number to round.
16488 * @param {number} [precision=0] The precision to round to.
16489 * @returns {number} Returns the rounded number.
16495 * _.round(4.006, 2);
16498 * _.round(4060, -2);
16501 var round = createRound('round');
16504 * Subtract two numbers.
16510 * @param {number} minuend The first number in a subtraction.
16511 * @param {number} subtrahend The second number in a subtraction.
16512 * @returns {number} Returns the difference.
16515 * _.subtract(6, 4);
16518 var subtract = createMathOperation(function(minuend, subtrahend) {
16519 return minuend - subtrahend;
16523 * Computes the sum of the values in `array`.
16529 * @param {Array} array The array to iterate over.
16530 * @returns {number} Returns the sum.
16533 * _.sum([4, 2, 8, 6]);
16536 function sum(array) {
16537 return (array && array.length)
16538 ? baseSum(array, identity)
16543 * This method is like `_.sum` except that it accepts `iteratee` which is
16544 * invoked for each element in `array` to generate the value to be summed.
16545 * The iteratee is invoked with one argument: (value).
16551 * @param {Array} array The array to iterate over.
16552 * @param {Function} [iteratee=_.identity] The iteratee invoked per element.
16553 * @returns {number} Returns the sum.
16556 * var objects = [{ 'n': 4 }, { 'n': 2 }, { 'n': 8 }, { 'n': 6 }];
16558 * _.sumBy(objects, function(o) { return o.n; });
16561 * // The `_.property` iteratee shorthand.
16562 * _.sumBy(objects, 'n');
16565 function sumBy(array, iteratee) {
16566 return (array && array.length)
16567 ? baseSum(array, getIteratee(iteratee, 2))
16571 /*------------------------------------------------------------------------*/
16573 // Add methods that return wrapped values in chain sequences.
16574 lodash.after = after;
16576 lodash.assign = assign;
16577 lodash.assignIn = assignIn;
16578 lodash.assignInWith = assignInWith;
16579 lodash.assignWith = assignWith;
16581 lodash.before = before;
16582 lodash.bind = bind;
16583 lodash.bindAll = bindAll;
16584 lodash.bindKey = bindKey;
16585 lodash.castArray = castArray;
16586 lodash.chain = chain;
16587 lodash.chunk = chunk;
16588 lodash.compact = compact;
16589 lodash.concat = concat;
16590 lodash.cond = cond;
16591 lodash.conforms = conforms;
16592 lodash.constant = constant;
16593 lodash.countBy = countBy;
16594 lodash.create = create;
16595 lodash.curry = curry;
16596 lodash.curryRight = curryRight;
16597 lodash.debounce = debounce;
16598 lodash.defaults = defaults;
16599 lodash.defaultsDeep = defaultsDeep;
16600 lodash.defer = defer;
16601 lodash.delay = delay;
16602 lodash.difference = difference;
16603 lodash.differenceBy = differenceBy;
16604 lodash.differenceWith = differenceWith;
16605 lodash.drop = drop;
16606 lodash.dropRight = dropRight;
16607 lodash.dropRightWhile = dropRightWhile;
16608 lodash.dropWhile = dropWhile;
16609 lodash.fill = fill;
16610 lodash.filter = filter;
16611 lodash.flatMap = flatMap;
16612 lodash.flatMapDeep = flatMapDeep;
16613 lodash.flatMapDepth = flatMapDepth;
16614 lodash.flatten = flatten;
16615 lodash.flattenDeep = flattenDeep;
16616 lodash.flattenDepth = flattenDepth;
16617 lodash.flip = flip;
16618 lodash.flow = flow;
16619 lodash.flowRight = flowRight;
16620 lodash.fromPairs = fromPairs;
16621 lodash.functions = functions;
16622 lodash.functionsIn = functionsIn;
16623 lodash.groupBy = groupBy;
16624 lodash.initial = initial;
16625 lodash.intersection = intersection;
16626 lodash.intersectionBy = intersectionBy;
16627 lodash.intersectionWith = intersectionWith;
16628 lodash.invert = invert;
16629 lodash.invertBy = invertBy;
16630 lodash.invokeMap = invokeMap;
16631 lodash.iteratee = iteratee;
16632 lodash.keyBy = keyBy;
16633 lodash.keys = keys;
16634 lodash.keysIn = keysIn;
16636 lodash.mapKeys = mapKeys;
16637 lodash.mapValues = mapValues;
16638 lodash.matches = matches;
16639 lodash.matchesProperty = matchesProperty;
16640 lodash.memoize = memoize;
16641 lodash.merge = merge;
16642 lodash.mergeWith = mergeWith;
16643 lodash.method = method;
16644 lodash.methodOf = methodOf;
16645 lodash.mixin = mixin;
16646 lodash.negate = negate;
16647 lodash.nthArg = nthArg;
16648 lodash.omit = omit;
16649 lodash.omitBy = omitBy;
16650 lodash.once = once;
16651 lodash.orderBy = orderBy;
16652 lodash.over = over;
16653 lodash.overArgs = overArgs;
16654 lodash.overEvery = overEvery;
16655 lodash.overSome = overSome;
16656 lodash.partial = partial;
16657 lodash.partialRight = partialRight;
16658 lodash.partition = partition;
16659 lodash.pick = pick;
16660 lodash.pickBy = pickBy;
16661 lodash.property = property;
16662 lodash.propertyOf = propertyOf;
16663 lodash.pull = pull;
16664 lodash.pullAll = pullAll;
16665 lodash.pullAllBy = pullAllBy;
16666 lodash.pullAllWith = pullAllWith;
16667 lodash.pullAt = pullAt;
16668 lodash.range = range;
16669 lodash.rangeRight = rangeRight;
16670 lodash.rearg = rearg;
16671 lodash.reject = reject;
16672 lodash.remove = remove;
16673 lodash.rest = rest;
16674 lodash.reverse = reverse;
16675 lodash.sampleSize = sampleSize;
16677 lodash.setWith = setWith;
16678 lodash.shuffle = shuffle;
16679 lodash.slice = slice;
16680 lodash.sortBy = sortBy;
16681 lodash.sortedUniq = sortedUniq;
16682 lodash.sortedUniqBy = sortedUniqBy;
16683 lodash.split = split;
16684 lodash.spread = spread;
16685 lodash.tail = tail;
16686 lodash.take = take;
16687 lodash.takeRight = takeRight;
16688 lodash.takeRightWhile = takeRightWhile;
16689 lodash.takeWhile = takeWhile;
16691 lodash.throttle = throttle;
16692 lodash.thru = thru;
16693 lodash.toArray = toArray;
16694 lodash.toPairs = toPairs;
16695 lodash.toPairsIn = toPairsIn;
16696 lodash.toPath = toPath;
16697 lodash.toPlainObject = toPlainObject;
16698 lodash.transform = transform;
16699 lodash.unary = unary;
16700 lodash.union = union;
16701 lodash.unionBy = unionBy;
16702 lodash.unionWith = unionWith;
16703 lodash.uniq = uniq;
16704 lodash.uniqBy = uniqBy;
16705 lodash.uniqWith = uniqWith;
16706 lodash.unset = unset;
16707 lodash.unzip = unzip;
16708 lodash.unzipWith = unzipWith;
16709 lodash.update = update;
16710 lodash.updateWith = updateWith;
16711 lodash.values = values;
16712 lodash.valuesIn = valuesIn;
16713 lodash.without = without;
16714 lodash.words = words;
16715 lodash.wrap = wrap;
16717 lodash.xorBy = xorBy;
16718 lodash.xorWith = xorWith;
16720 lodash.zipObject = zipObject;
16721 lodash.zipObjectDeep = zipObjectDeep;
16722 lodash.zipWith = zipWith;
16725 lodash.entries = toPairs;
16726 lodash.entriesIn = toPairsIn;
16727 lodash.extend = assignIn;
16728 lodash.extendWith = assignInWith;
16730 // Add methods to `lodash.prototype`.
16731 mixin(lodash, lodash);
16733 /*------------------------------------------------------------------------*/
16735 // Add methods that return unwrapped values in chain sequences.
16737 lodash.attempt = attempt;
16738 lodash.camelCase = camelCase;
16739 lodash.capitalize = capitalize;
16740 lodash.ceil = ceil;
16741 lodash.clamp = clamp;
16742 lodash.clone = clone;
16743 lodash.cloneDeep = cloneDeep;
16744 lodash.cloneDeepWith = cloneDeepWith;
16745 lodash.cloneWith = cloneWith;
16746 lodash.conformsTo = conformsTo;
16747 lodash.deburr = deburr;
16748 lodash.defaultTo = defaultTo;
16749 lodash.divide = divide;
16750 lodash.endsWith = endsWith;
16752 lodash.escape = escape;
16753 lodash.escapeRegExp = escapeRegExp;
16754 lodash.every = every;
16755 lodash.find = find;
16756 lodash.findIndex = findIndex;
16757 lodash.findKey = findKey;
16758 lodash.findLast = findLast;
16759 lodash.findLastIndex = findLastIndex;
16760 lodash.findLastKey = findLastKey;
16761 lodash.floor = floor;
16762 lodash.forEach = forEach;
16763 lodash.forEachRight = forEachRight;
16764 lodash.forIn = forIn;
16765 lodash.forInRight = forInRight;
16766 lodash.forOwn = forOwn;
16767 lodash.forOwnRight = forOwnRight;
16772 lodash.hasIn = hasIn;
16773 lodash.head = head;
16774 lodash.identity = identity;
16775 lodash.includes = includes;
16776 lodash.indexOf = indexOf;
16777 lodash.inRange = inRange;
16778 lodash.invoke = invoke;
16779 lodash.isArguments = isArguments;
16780 lodash.isArray = isArray;
16781 lodash.isArrayBuffer = isArrayBuffer;
16782 lodash.isArrayLike = isArrayLike;
16783 lodash.isArrayLikeObject = isArrayLikeObject;
16784 lodash.isBoolean = isBoolean;
16785 lodash.isBuffer = isBuffer;
16786 lodash.isDate = isDate;
16787 lodash.isElement = isElement;
16788 lodash.isEmpty = isEmpty;
16789 lodash.isEqual = isEqual;
16790 lodash.isEqualWith = isEqualWith;
16791 lodash.isError = isError;
16792 lodash.isFinite = isFinite;
16793 lodash.isFunction = isFunction;
16794 lodash.isInteger = isInteger;
16795 lodash.isLength = isLength;
16796 lodash.isMap = isMap;
16797 lodash.isMatch = isMatch;
16798 lodash.isMatchWith = isMatchWith;
16799 lodash.isNaN = isNaN;
16800 lodash.isNative = isNative;
16801 lodash.isNil = isNil;
16802 lodash.isNull = isNull;
16803 lodash.isNumber = isNumber;
16804 lodash.isObject = isObject;
16805 lodash.isObjectLike = isObjectLike;
16806 lodash.isPlainObject = isPlainObject;
16807 lodash.isRegExp = isRegExp;
16808 lodash.isSafeInteger = isSafeInteger;
16809 lodash.isSet = isSet;
16810 lodash.isString = isString;
16811 lodash.isSymbol = isSymbol;
16812 lodash.isTypedArray = isTypedArray;
16813 lodash.isUndefined = isUndefined;
16814 lodash.isWeakMap = isWeakMap;
16815 lodash.isWeakSet = isWeakSet;
16816 lodash.join = join;
16817 lodash.kebabCase = kebabCase;
16818 lodash.last = last;
16819 lodash.lastIndexOf = lastIndexOf;
16820 lodash.lowerCase = lowerCase;
16821 lodash.lowerFirst = lowerFirst;
16825 lodash.maxBy = maxBy;
16826 lodash.mean = mean;
16827 lodash.meanBy = meanBy;
16829 lodash.minBy = minBy;
16830 lodash.stubArray = stubArray;
16831 lodash.stubFalse = stubFalse;
16832 lodash.stubObject = stubObject;
16833 lodash.stubString = stubString;
16834 lodash.stubTrue = stubTrue;
16835 lodash.multiply = multiply;
16837 lodash.noConflict = noConflict;
16838 lodash.noop = noop;
16841 lodash.padEnd = padEnd;
16842 lodash.padStart = padStart;
16843 lodash.parseInt = parseInt;
16844 lodash.random = random;
16845 lodash.reduce = reduce;
16846 lodash.reduceRight = reduceRight;
16847 lodash.repeat = repeat;
16848 lodash.replace = replace;
16849 lodash.result = result;
16850 lodash.round = round;
16851 lodash.runInContext = runInContext;
16852 lodash.sample = sample;
16853 lodash.size = size;
16854 lodash.snakeCase = snakeCase;
16855 lodash.some = some;
16856 lodash.sortedIndex = sortedIndex;
16857 lodash.sortedIndexBy = sortedIndexBy;
16858 lodash.sortedIndexOf = sortedIndexOf;
16859 lodash.sortedLastIndex = sortedLastIndex;
16860 lodash.sortedLastIndexBy = sortedLastIndexBy;
16861 lodash.sortedLastIndexOf = sortedLastIndexOf;
16862 lodash.startCase = startCase;
16863 lodash.startsWith = startsWith;
16864 lodash.subtract = subtract;
16866 lodash.sumBy = sumBy;
16867 lodash.template = template;
16868 lodash.times = times;
16869 lodash.toFinite = toFinite;
16870 lodash.toInteger = toInteger;
16871 lodash.toLength = toLength;
16872 lodash.toLower = toLower;
16873 lodash.toNumber = toNumber;
16874 lodash.toSafeInteger = toSafeInteger;
16875 lodash.toString = toString;
16876 lodash.toUpper = toUpper;
16877 lodash.trim = trim;
16878 lodash.trimEnd = trimEnd;
16879 lodash.trimStart = trimStart;
16880 lodash.truncate = truncate;
16881 lodash.unescape = unescape;
16882 lodash.uniqueId = uniqueId;
16883 lodash.upperCase = upperCase;
16884 lodash.upperFirst = upperFirst;
16887 lodash.each = forEach;
16888 lodash.eachRight = forEachRight;
16889 lodash.first = head;
16891 mixin(lodash, (function() {
16893 baseForOwn(lodash, function(func, methodName) {
16894 if (!hasOwnProperty.call(lodash.prototype, methodName)) {
16895 source[methodName] = func;
16899 }()), { 'chain': false });
16901 /*------------------------------------------------------------------------*/
16904 * The semantic version number.
16910 lodash.VERSION = VERSION;
16912 // Assign default placeholders.
16913 arrayEach(['bind', 'bindKey', 'curry', 'curryRight', 'partial', 'partialRight'], function(methodName) {
16914 lodash[methodName].placeholder = lodash;
16917 // Add `LazyWrapper` methods for `_.drop` and `_.take` variants.
16918 arrayEach(['drop', 'take'], function(methodName, index) {
16919 LazyWrapper.prototype[methodName] = function(n) {
16920 n = n === undefined ? 1 : nativeMax(toInteger(n), 0);
16922 var result = (this.__filtered__ && !index)
16923 ? new LazyWrapper(this)
16926 if (result.__filtered__) {
16927 result.__takeCount__ = nativeMin(n, result.__takeCount__);
16929 result.__views__.push({
16930 'size': nativeMin(n, MAX_ARRAY_LENGTH),
16931 'type': methodName + (result.__dir__ < 0 ? 'Right' : '')
16937 LazyWrapper.prototype[methodName + 'Right'] = function(n) {
16938 return this.reverse()[methodName](n).reverse();
16942 // Add `LazyWrapper` methods that accept an `iteratee` value.
16943 arrayEach(['filter', 'map', 'takeWhile'], function(methodName, index) {
16944 var type = index + 1,
16945 isFilter = type == LAZY_FILTER_FLAG || type == LAZY_WHILE_FLAG;
16947 LazyWrapper.prototype[methodName] = function(iteratee) {
16948 var result = this.clone();
16949 result.__iteratees__.push({
16950 'iteratee': getIteratee(iteratee, 3),
16953 result.__filtered__ = result.__filtered__ || isFilter;
16958 // Add `LazyWrapper` methods for `_.head` and `_.last`.
16959 arrayEach(['head', 'last'], function(methodName, index) {
16960 var takeName = 'take' + (index ? 'Right' : '');
16962 LazyWrapper.prototype[methodName] = function() {
16963 return this[takeName](1).value()[0];
16967 // Add `LazyWrapper` methods for `_.initial` and `_.tail`.
16968 arrayEach(['initial', 'tail'], function(methodName, index) {
16969 var dropName = 'drop' + (index ? '' : 'Right');
16971 LazyWrapper.prototype[methodName] = function() {
16972 return this.__filtered__ ? new LazyWrapper(this) : this[dropName](1);
16976 LazyWrapper.prototype.compact = function() {
16977 return this.filter(identity);
16980 LazyWrapper.prototype.find = function(predicate) {
16981 return this.filter(predicate).head();
16984 LazyWrapper.prototype.findLast = function(predicate) {
16985 return this.reverse().find(predicate);
16988 LazyWrapper.prototype.invokeMap = baseRest(function(path, args) {
16989 if (typeof path == 'function') {
16990 return new LazyWrapper(this);
16992 return this.map(function(value) {
16993 return baseInvoke(value, path, args);
16997 LazyWrapper.prototype.reject = function(predicate) {
16998 return this.filter(negate(getIteratee(predicate)));
17001 LazyWrapper.prototype.slice = function(start, end) {
17002 start = toInteger(start);
17005 if (result.__filtered__ && (start > 0 || end < 0)) {
17006 return new LazyWrapper(result);
17009 result = result.takeRight(-start);
17010 } else if (start) {
17011 result = result.drop(start);
17013 if (end !== undefined) {
17014 end = toInteger(end);
17015 result = end < 0 ? result.dropRight(-end) : result.take(end - start);
17020 LazyWrapper.prototype.takeRightWhile = function(predicate) {
17021 return this.reverse().takeWhile(predicate).reverse();
17024 LazyWrapper.prototype.toArray = function() {
17025 return this.take(MAX_ARRAY_LENGTH);
17028 // Add `LazyWrapper` methods to `lodash.prototype`.
17029 baseForOwn(LazyWrapper.prototype, function(func, methodName) {
17030 var checkIteratee = /^(?:filter|find|map|reject)|While$/.test(methodName),
17031 isTaker = /^(?:head|last)$/.test(methodName),
17032 lodashFunc = lodash[isTaker ? ('take' + (methodName == 'last' ? 'Right' : '')) : methodName],
17033 retUnwrapped = isTaker || /^find/.test(methodName);
17038 lodash.prototype[methodName] = function() {
17039 var value = this.__wrapped__,
17040 args = isTaker ? [1] : arguments,
17041 isLazy = value instanceof LazyWrapper,
17042 iteratee = args[0],
17043 useLazy = isLazy || isArray(value);
17045 var interceptor = function(value) {
17046 var result = lodashFunc.apply(lodash, arrayPush([value], args));
17047 return (isTaker && chainAll) ? result[0] : result;
17050 if (useLazy && checkIteratee && typeof iteratee == 'function' && iteratee.length != 1) {
17051 // Avoid lazy use if the iteratee has a "length" value other than `1`.
17052 isLazy = useLazy = false;
17054 var chainAll = this.__chain__,
17055 isHybrid = !!this.__actions__.length,
17056 isUnwrapped = retUnwrapped && !chainAll,
17057 onlyLazy = isLazy && !isHybrid;
17059 if (!retUnwrapped && useLazy) {
17060 value = onlyLazy ? value : new LazyWrapper(this);
17061 var result = func.apply(value, args);
17062 result.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
17063 return new LodashWrapper(result, chainAll);
17065 if (isUnwrapped && onlyLazy) {
17066 return func.apply(this, args);
17068 result = this.thru(interceptor);
17069 return isUnwrapped ? (isTaker ? result.value()[0] : result.value()) : result;
17073 // Add `Array` methods to `lodash.prototype`.
17074 arrayEach(['pop', 'push', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
17075 var func = arrayProto[methodName],
17076 chainName = /^(?:push|sort|unshift)$/.test(methodName) ? 'tap' : 'thru',
17077 retUnwrapped = /^(?:pop|shift)$/.test(methodName);
17079 lodash.prototype[methodName] = function() {
17080 var args = arguments;
17081 if (retUnwrapped && !this.__chain__) {
17082 var value = this.value();
17083 return func.apply(isArray(value) ? value : [], args);
17085 return this[chainName](function(value) {
17086 return func.apply(isArray(value) ? value : [], args);
17091 // Map minified method names to their real names.
17092 baseForOwn(LazyWrapper.prototype, function(func, methodName) {
17093 var lodashFunc = lodash[methodName];
17095 var key = lodashFunc.name + '';
17096 if (!hasOwnProperty.call(realNames, key)) {
17097 realNames[key] = [];
17099 realNames[key].push({ 'name': methodName, 'func': lodashFunc });
17103 realNames[createHybrid(undefined, WRAP_BIND_KEY_FLAG).name] = [{
17108 // Add methods to `LazyWrapper`.
17109 LazyWrapper.prototype.clone = lazyClone;
17110 LazyWrapper.prototype.reverse = lazyReverse;
17111 LazyWrapper.prototype.value = lazyValue;
17113 // Add chain sequence methods to the `lodash` wrapper.
17114 lodash.prototype.at = wrapperAt;
17115 lodash.prototype.chain = wrapperChain;
17116 lodash.prototype.commit = wrapperCommit;
17117 lodash.prototype.next = wrapperNext;
17118 lodash.prototype.plant = wrapperPlant;
17119 lodash.prototype.reverse = wrapperReverse;
17120 lodash.prototype.toJSON = lodash.prototype.valueOf = lodash.prototype.value = wrapperValue;
17122 // Add lazy aliases.
17123 lodash.prototype.first = lodash.prototype.head;
17126 lodash.prototype[symIterator] = wrapperToIterator;
17131 /*--------------------------------------------------------------------------*/
17134 var _ = runInContext();
17136 // Some AMD build optimizers, like r.js, check for condition patterns like:
17137 if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
17138 // Expose Lodash on the global object to prevent errors when Lodash is
17139 // loaded by a script tag in the presence of an AMD loader.
17140 // See http://requirejs.org/docs/errors.html#mismatch for more details.
17141 // Use `_.noConflict` to remove Lodash from the global object.
17144 // Define as an anonymous module so, through path mapping, it can be
17145 // referenced as the "underscore" module.
17146 define(function() {
17150 // Check for `exports` after `define` in case a build optimizer adds it.
17151 else if (freeModule) {
17152 // Export for Node.js.
17153 (freeModule.exports = _)._ = _;
17154 // Export for CommonJS support.
17158 // Export to the global object.