16 lines
541 B
JavaScript
16 lines
541 B
JavaScript
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// 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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};
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