main
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Last change
on this file was d24f17c, checked in by Aleksandar Panovski <apano77@…>, 15 months ago |
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Initial commit
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File size:
773 bytes
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| 1 | 'use strict';
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| 2 | var isArray = require('../internals/is-array');
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| 3 | var isConstructor = require('../internals/is-constructor');
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| 4 | var isObject = require('../internals/is-object');
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| 5 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 6 |
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| 7 | var SPECIES = wellKnownSymbol('species');
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| 8 | var $Array = Array;
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| 9 |
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| 10 | // a part of `ArraySpeciesCreate` abstract operation
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| 11 | // https://tc39.es/ecma262/#sec-arrayspeciescreate
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| 12 | module.exports = function (originalArray) {
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| 13 | var C;
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| 14 | if (isArray(originalArray)) {
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| 15 | C = originalArray.constructor;
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| 16 | // cross-realm fallback
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| 17 | if (isConstructor(C) && (C === $Array || isArray(C.prototype))) C = undefined;
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| 18 | else if (isObject(C)) {
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| 19 | C = C[SPECIES];
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| 20 | if (C === null) C = undefined;
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| 21 | }
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| 22 | } return C === undefined ? $Array : C;
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| 23 | };
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