| 'use strict'; |
| |
| var GetIntrinsic = require('get-intrinsic'); |
| |
| 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); |
| }; |
| |