44 lines
1.3 KiB
JavaScript
44 lines
1.3 KiB
JavaScript
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'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var callBound = require('../helpers/callBound');
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var $TypeError = GetIntrinsic('%TypeError%');
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var $indexOf = callBound('Array.prototype.indexOf', true) || callBound('String.prototype.indexOf');
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var $push = callBound('Array.prototype.push');
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var Get = require('./Get');
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var IsArray = require('./IsArray');
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var ToLength = require('./ToLength');
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var ToString = require('./ToString');
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var Type = require('./Type');
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// https://ecma-international.org/ecma-262/6.0/#sec-createlistfromarraylike
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module.exports = function CreateListFromArrayLike(obj) {
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var elementTypes = arguments.length > 1
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? arguments[1]
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: ['Undefined', 'Null', 'Boolean', 'String', 'Symbol', 'Number', 'Object'];
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if (Type(obj) !== 'Object') {
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throw new $TypeError('Assertion failed: `obj` must be an Object');
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}
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if (!IsArray(elementTypes)) {
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throw new $TypeError('Assertion failed: `elementTypes`, if provided, must be an array');
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}
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var len = ToLength(Get(obj, 'length'));
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var list = [];
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var index = 0;
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while (index < len) {
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var indexName = ToString(index);
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var next = Get(obj, indexName);
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var nextType = Type(next);
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if ($indexOf(elementTypes, nextType) < 0) {
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throw new $TypeError('item type ' + nextType + ' is not a valid elementType');
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}
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$push(list, next);
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index += 1;
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}
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return list;
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};
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