source: imaps-frontend/node_modules/es-abstract/2018/CreateListFromArrayLike.js

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Last change on this file was d565449, checked in by stefan toskovski <stefantoska84@…>, 4 weeks ago

Update repo after prototype presentation

  • Property mode set to 100644
File size: 1.3 KB
RevLine 
[d565449]1'use strict';
2
3var callBound = require('call-bind/callBound');
4
5var $TypeError = require('es-errors/type');
6var $indexOf = callBound('Array.prototype.indexOf', true) || callBound('String.prototype.indexOf');
7var $push = callBound('Array.prototype.push');
8
9var Get = require('./Get');
10var IsArray = require('./IsArray');
11var ToLength = require('./ToLength');
12var ToString = require('./ToString');
13var Type = require('./Type');
14
15var defaultElementTypes = ['Undefined', 'Null', 'Boolean', 'String', 'Symbol', 'Number', 'Object'];
16
17// https://262.ecma-international.org/6.0/#sec-createlistfromarraylike
18module.exports = function CreateListFromArrayLike(obj) {
19 var elementTypes = arguments.length > 1
20 ? arguments[1]
21 : defaultElementTypes;
22
23 if (Type(obj) !== 'Object') {
24 throw new $TypeError('Assertion failed: `obj` must be an Object');
25 }
26 if (!IsArray(elementTypes)) {
27 throw new $TypeError('Assertion failed: `elementTypes`, if provided, must be an array');
28 }
29 var len = ToLength(Get(obj, 'length'));
30 var list = [];
31 var index = 0;
32 while (index < len) {
33 var indexName = ToString(index);
34 var next = Get(obj, indexName);
35 var nextType = Type(next);
36 if ($indexOf(elementTypes, nextType) < 0) {
37 throw new $TypeError('item type ' + nextType + ' is not a valid elementType');
38 }
39 $push(list, next);
40 index += 1;
41 }
42 return list;
43};
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