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22 lines
759 B
22 lines
759 B
var isArray = require('../internals/is-array'); |
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var isConstructor = require('../internals/is-constructor'); |
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var isObject = require('../internals/is-object'); |
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var wellKnownSymbol = require('../internals/well-known-symbol'); |
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var SPECIES = wellKnownSymbol('species'); |
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var $Array = Array; |
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// a part of `ArraySpeciesCreate` abstract operation |
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// https://tc39.es/ecma262/#sec-arrayspeciescreate |
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module.exports = function (originalArray) { |
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var C; |
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if (isArray(originalArray)) { |
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C = originalArray.constructor; |
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// cross-realm fallback |
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if (isConstructor(C) && (C === $Array || isArray(C.prototype))) C = undefined; |
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else if (isObject(C)) { |
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C = C[SPECIES]; |
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if (C === null) C = undefined; |
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} |
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} return C === undefined ? $Array : C; |
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};
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