2 var $ = require('../internals/export');
3 var global = require('../internals/global');
4 var isArray = require('../internals/is-array');
5 var isConstructor = require('../internals/is-constructor');
6 var isObject = require('../internals/is-object');
7 var toAbsoluteIndex = require('../internals/to-absolute-index');
8 var lengthOfArrayLike = require('../internals/length-of-array-like');
9 var toIndexedObject = require('../internals/to-indexed-object');
10 var createProperty = require('../internals/create-property');
11 var wellKnownSymbol = require('../internals/well-known-symbol');
12 var arrayMethodHasSpeciesSupport = require('../internals/array-method-has-species-support');
13 var un$Slice = require('../internals/array-slice');
15 var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('slice');
17 var SPECIES = wellKnownSymbol('species');
18 var Array = global.Array;
21 // `Array.prototype.slice` method
22 // https://tc39.es/ecma262/#sec-array.prototype.slice
23 // fallback for not array-like ES3 strings and DOM objects
24 $({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT }, {
25 slice: function slice(start, end) {
26 var O = toIndexedObject(this);
27 var length = lengthOfArrayLike(O);
28 var k = toAbsoluteIndex(start, length);
29 var fin = toAbsoluteIndex(end === undefined ? length : end, length);
30 // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible
31 var Constructor, result, n;
33 Constructor = O.constructor;
34 // cross-realm fallback
35 if (isConstructor(Constructor) && (Constructor === Array || isArray(Constructor.prototype))) {
36 Constructor = undefined;
37 } else if (isObject(Constructor)) {
38 Constructor = Constructor[SPECIES];
39 if (Constructor === null) Constructor = undefined;
41 if (Constructor === Array || Constructor === undefined) {
42 return un$Slice(O, k, fin);
45 result = new (Constructor === undefined ? Array : Constructor)(max(fin - k, 0));
46 for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);