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46 lines
1.3 KiB
46 lines
1.3 KiB
'use strict'; |
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var GetIntrinsic = require('get-intrinsic'); |
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var $Array = GetIntrinsic('%Array%'); |
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var $species = GetIntrinsic('%Symbol.species%', true); |
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var $TypeError = GetIntrinsic('%TypeError%'); |
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var Get = require('./Get'); |
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var IsArray = require('./IsArray'); |
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var IsConstructor = require('./IsConstructor'); |
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var IsInteger = require('./IsInteger'); |
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var Type = require('./Type'); |
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// https://ecma-international.org/ecma-262/6.0/#sec-arrayspeciescreate |
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module.exports = function ArraySpeciesCreate(originalArray, length) { |
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if (!IsInteger(length) || length < 0) { |
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throw new $TypeError('Assertion failed: length must be an integer >= 0'); |
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} |
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var len = length === 0 ? 0 : length; |
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var C; |
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var isArray = IsArray(originalArray); |
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if (isArray) { |
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C = Get(originalArray, 'constructor'); |
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// TODO: figure out how to make a cross-realm normal Array, a same-realm Array |
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// if (IsConstructor(C)) { |
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// if C is another realm's Array, C = undefined |
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// Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(Array))) === null ? |
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// } |
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if ($species && Type(C) === 'Object') { |
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C = Get(C, $species); |
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if (C === null) { |
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C = void 0; |
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} |
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} |
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} |
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if (typeof C === 'undefined') { |
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return $Array(len); |
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} |
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if (!IsConstructor(C)) { |
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throw new $TypeError('C must be a constructor'); |
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} |
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return new C(len); // Construct(C, len); |
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}; |
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