1 var bind = require('../internals/function-bind-context');
2 var IndexedObject = require('../internals/indexed-object');
3 var toObject = require('../internals/to-object');
4 var toLength = require('../internals/to-length');
5 var arraySpeciesCreate = require('../internals/array-species-create');
9 // `Array.prototype.{ forEach, map, filter, some, every, find, findIndex, filterOut }` methods implementation
10 var createMethod = function (TYPE) {
11 var IS_MAP = TYPE == 1;
12 var IS_FILTER = TYPE == 2;
13 var IS_SOME = TYPE == 3;
14 var IS_EVERY = TYPE == 4;
15 var IS_FIND_INDEX = TYPE == 6;
16 var IS_FILTER_OUT = TYPE == 7;
17 var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
18 return function ($this, callbackfn, that, specificCreate) {
19 var O = toObject($this);
20 var self = IndexedObject(O);
21 var boundFunction = bind(callbackfn, that, 3);
22 var length = toLength(self.length);
24 var create = specificCreate || arraySpeciesCreate;
25 var target = IS_MAP ? create($this, length) : IS_FILTER || IS_FILTER_OUT ? create($this, 0) : undefined;
27 for (;length > index; index++) if (NO_HOLES || index in self) {
29 result = boundFunction(value, index, O);
31 if (IS_MAP) target[index] = result; // map
32 else if (result) switch (TYPE) {
33 case 3: return true; // some
34 case 5: return value; // find
35 case 6: return index; // findIndex
36 case 2: push.call(target, value); // filter
37 } else switch (TYPE) {
38 case 4: return false; // every
39 case 7: push.call(target, value); // filterOut
43 return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;
48 // `Array.prototype.forEach` method
49 // https://tc39.github.io/ecma262/#sec-array.prototype.foreach
50 forEach: createMethod(0),
51 // `Array.prototype.map` method
52 // https://tc39.github.io/ecma262/#sec-array.prototype.map
54 // `Array.prototype.filter` method
55 // https://tc39.github.io/ecma262/#sec-array.prototype.filter
56 filter: createMethod(2),
57 // `Array.prototype.some` method
58 // https://tc39.github.io/ecma262/#sec-array.prototype.some
59 some: createMethod(3),
60 // `Array.prototype.every` method
61 // https://tc39.github.io/ecma262/#sec-array.prototype.every
62 every: createMethod(4),
63 // `Array.prototype.find` method
64 // https://tc39.github.io/ecma262/#sec-array.prototype.find
65 find: createMethod(5),
66 // `Array.prototype.findIndex` method
67 // https://tc39.github.io/ecma262/#sec-array.prototype.findIndex
68 findIndex: createMethod(6),
69 // `Array.prototype.filterOut` method
70 // https://github.com/tc39/proposal-array-filtering
71 filterOut: createMethod(7)