49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var GetIntrinsic = require('get-intrinsic');
|
||
|
|
|
||
|
|
var $species = GetIntrinsic('%Symbol.species%', true);
|
||
|
|
var $TypeError = GetIntrinsic('%TypeError%');
|
||
|
|
|
||
|
|
var ArrayCreate = require('./ArrayCreate');
|
||
|
|
var Get = require('./Get');
|
||
|
|
var IsArray = require('./IsArray');
|
||
|
|
var IsConstructor = require('./IsConstructor');
|
||
|
|
var IsIntegralNumber = require('./IsIntegralNumber');
|
||
|
|
var Type = require('./Type');
|
||
|
|
|
||
|
|
// https://ecma-international.org/ecma-262/12.0/#sec-arrayspeciescreate
|
||
|
|
|
||
|
|
module.exports = function ArraySpeciesCreate(originalArray, length) {
|
||
|
|
if (!IsIntegralNumber(length) || length < 0) {
|
||
|
|
throw new $TypeError('Assertion failed: length must be an integer >= 0');
|
||
|
|
}
|
||
|
|
|
||
|
|
var isArray = IsArray(originalArray);
|
||
|
|
if (!isArray) {
|
||
|
|
return ArrayCreate(length);
|
||
|
|
}
|
||
|
|
|
||
|
|
var C = Get(originalArray, 'constructor');
|
||
|
|
// TODO: figure out how to make a cross-realm normal Array, a same-realm Array
|
||
|
|
// if (IsConstructor(C)) {
|
||
|
|
// if C is another realm's Array, C = undefined
|
||
|
|
// Object.getPrototypeOf(Object.getPrototypeOf(Object.getPrototypeOf(Array))) === null ?
|
||
|
|
// }
|
||
|
|
if ($species && Type(C) === 'Object') {
|
||
|
|
C = Get(C, $species);
|
||
|
|
if (C === null) {
|
||
|
|
C = void 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (typeof C === 'undefined') {
|
||
|
|
return ArrayCreate(length);
|
||
|
|
}
|
||
|
|
if (!IsConstructor(C)) {
|
||
|
|
throw new $TypeError('C must be a constructor');
|
||
|
|
}
|
||
|
|
return new C(length); // Construct(C, length);
|
||
|
|
};
|
||
|
|
|