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20 lines
721 B
20 lines
721 B
var isObject = require('../internals/is-object'); |
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var isArray = require('../internals/is-array'); |
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var wellKnownSymbol = require('../internals/well-known-symbol'); |
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var SPECIES = wellKnownSymbol('species'); |
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// `ArraySpeciesCreate` abstract operation |
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// https://tc39.github.io/ecma262/#sec-arrayspeciescreate |
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module.exports = function (originalArray, length) { |
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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 (typeof C == 'function' && (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 new (C === undefined ? Array : C)(length === 0 ? 0 : length); |
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};
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