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16 lines
541 B
16 lines
541 B
// 9.4.2.3 ArraySpeciesCreate(originalArray, length) |
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var isObject = require('./$.is-object') |
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, isArray = require('./$.is-array') |
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, SPECIES = require('./$.wks')('species'); |
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module.exports = function(original, length){ |
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var C; |
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if(isArray(original)){ |
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C = original.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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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); |
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}; |