source: frontend/node_modules/es-abstract/2020/CreateListFromArrayLike.js

Last change on this file was 9af201e, checked in by MBK <marija.karapandzova@…>, 12 days ago

Fix frontend appearance

  • Property mode set to 100644
File size: 1.5 KB
Line 
1'use strict';
2
3var callBound = require('call-bound');
4
5var $TypeError = require('es-errors/type');
6var isObject = require('es-object-atoms/isObject');
7var $indexOf = callBound('Array.prototype.indexOf', true) || callBound('String.prototype.indexOf');
8
9var Get = require('./Get');
10var IsArray = require('./IsArray');
11var LengthOfArrayLike = require('./LengthOfArrayLike');
12var ToString = require('./ToString');
13var Type = require('./Type');
14
15var defaultElementTypes = ['Undefined', 'Null', 'Boolean', 'String', 'Symbol', 'Number', 'BigInt', 'Object'];
16
17// https://262.ecma-international.org/11.0/#sec-createlistfromarraylike
18
19/** @type {(obj: object, elementTypes?: typeof defaultElementTypes) => unknown[]} */
20module.exports = function CreateListFromArrayLike(obj) {
21 var elementTypes = arguments.length > 1
22 ? arguments[1]
23 : defaultElementTypes;
24
25 if (!isObject(obj)) {
26 throw new $TypeError('Assertion failed: `obj` must be an Object');
27 }
28 if (!IsArray(elementTypes)) {
29 throw new $TypeError('Assertion failed: `elementTypes`, if provided, must be an array');
30 }
31 var len = LengthOfArrayLike(obj);
32 /** @type {(typeof elementTypes)[]} */
33 var list = [];
34 var index = 0;
35 while (index < len) {
36 var indexName = ToString(index);
37 var next = Get(obj, indexName);
38 var nextType = Type(next);
39 if ($indexOf(elementTypes, nextType) < 0) {
40 throw new $TypeError('item type ' + nextType + ' is not a valid elementType');
41 }
42 list[list.length] = next;
43 index += 1;
44 }
45 return list;
46};
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