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node_modules/es-abstract/2017/ArraySpeciesCreate.js
| 46 lines
| 1.3 KiB
| application/javascript
| JavascriptLexer
|
| r789 | 'use strict'; | |||
| var GetIntrinsic = require('../GetIntrinsic'); | ||||
| var $Array = GetIntrinsic('%Array%'); | ||||
| var $species = GetIntrinsic('%Symbol.species%', true); | ||||
| var $TypeError = GetIntrinsic('%TypeError%'); | ||||
| var Get = require('./Get'); | ||||
| var IsArray = require('./IsArray'); | ||||
| var IsConstructor = require('./IsConstructor'); | ||||
| var IsInteger = require('./IsInteger'); | ||||
| var Type = require('./Type'); | ||||
| // https://ecma-international.org/ecma-262/6.0/#sec-arrayspeciescreate | ||||
| module.exports = function ArraySpeciesCreate(originalArray, length) { | ||||
| if (!IsInteger(length) || length < 0) { | ||||
| throw new $TypeError('Assertion failed: length must be an integer >= 0'); | ||||
| } | ||||
| var len = length === 0 ? 0 : length; | ||||
| var C; | ||||
| var isArray = IsArray(originalArray); | ||||
| if (isArray) { | ||||
| C = Get(originalArray, 'constructor'); | ||||
| // TODO: figure out how to make a cross-realm normal Array, a same-realm Array | ||||
| // if (IsConstructor(C)) { | ||||
| // if C is another realm's Array, C = undefined | ||||
| // Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(Array))) === null ? | ||||
| // } | ||||
| if ($species && Type(C) === 'Object') { | ||||
| C = Get(C, $species); | ||||
| if (C === null) { | ||||
| C = void 0; | ||||
| } | ||||
| } | ||||
| } | ||||
| if (typeof C === 'undefined') { | ||||
| return $Array(len); | ||||
| } | ||||
| if (!IsConstructor(C)) { | ||||
| throw new $TypeError('C must be a constructor'); | ||||
| } | ||||
| return new C(len); // Construct(C, len); | ||||
| }; | ||||