49 lines
1.3 KiB
Plaintext
49 lines
1.3 KiB
Plaintext
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $species = GetIntrinsic('%Symbol.species%', true);
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var $TypeError = require('es-errors/type');
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var isInteger = require('math-intrinsics/isInteger');
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var isObject = require('es-object-atoms/isObject');
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var ArrayCreate = require('./ArrayCreate');
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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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// https://262.ecma-international.org/12.0/#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 $TypeError('Assertion failed: length must be an integer >= 0');
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}
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var isArray = IsArray(originalArray);
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if (!isArray) {
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return ArrayCreate(length);
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}
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var C = Get(originalArray, 'constructor');
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// TODO: figure out how to make a cross-realm normal Array, a same-realm Array
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// if (IsConstructor(C)) {
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// if C is another realm's Array, C = undefined
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// Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(Array))) === null ?
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// }
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if ($species && isObject(C)) {
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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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if (typeof C === 'undefined') {
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return ArrayCreate(length);
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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(length); // Construct(C, length);
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};
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