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Last change
on this file since ceaed42 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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initial commit
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| 1 | var isObject = require('../internals/is-object');
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| 2 | var isArray = require('../internals/is-array');
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| 3 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 4 |
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| 5 | var SPECIES = wellKnownSymbol('species');
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| 6 |
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| 7 | // a part of `ArraySpeciesCreate` abstract operation
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| 8 | // https://tc39.es/ecma262/#sec-arrayspeciescreate
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| 9 | module.exports = function (originalArray) {
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| 10 | var C;
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| 11 | if (isArray(originalArray)) {
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| 12 | C = originalArray.constructor;
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| 13 | // cross-realm fallback
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| 14 | if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;
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| 15 | else if (isObject(C)) {
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| 16 | C = C[SPECIES];
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| 17 | if (C === null) C = undefined;
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| 18 | }
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| 19 | } return C === undefined ? Array : C;
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| 20 | };
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