56 lines
1.7 KiB
JavaScript
56 lines
1.7 KiB
JavaScript
'use strict';
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var callBound = require('call-bind/callBound');
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var $arrayPush = callBound('Array.prototype.push');
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var getIteratorMethod = require('../helpers/getIteratorMethod');
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var AdvanceStringIndex = require('./AdvanceStringIndex');
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var GetIterator = require('./GetIterator');
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var GetMethod = require('./GetMethod');
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var IsArray = require('./IsArray');
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var IteratorStep = require('./IteratorStep');
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var IteratorValue = require('./IteratorValue');
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var ToObject = require('./ToObject');
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var Type = require('./Type');
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var ES = {
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AdvanceStringIndex: AdvanceStringIndex,
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GetMethod: GetMethod,
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IsArray: IsArray,
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Type: Type
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};
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// https://262.ecma-international.org/7.0/#sec-iterabletoarraylike
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/**
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* 1. Let usingIterator be ? GetMethod(items, @@iterator).
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* 2. If usingIterator is not undefined, then
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* 1. Let iterator be ? GetIterator(items, usingIterator).
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* 2. Let values be a new empty List.
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* 3. Let next be true.
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* 4. Repeat, while next is not false
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* 1. Let next be ? IteratorStep(iterator).
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* 2. If next is not false, then
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* 1. Let nextValue be ? IteratorValue(next).
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* 2. Append nextValue to the end of the List values.
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* 5. Return CreateArrayFromList(values).
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* 3. NOTE: items is not an Iterable so assume it is already an array-like object.
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* 4. Return ! ToObject(items).
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*/
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module.exports = function IterableToArrayLike(items) {
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var usingIterator = getIteratorMethod(ES, items);
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if (typeof usingIterator !== 'undefined') {
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var iterator = GetIterator(items, usingIterator);
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var values = [];
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var next = true;
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while (next) {
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next = IteratorStep(iterator);
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if (next) {
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var nextValue = IteratorValue(next);
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$arrayPush(values, nextValue);
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}
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}
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return values;
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}
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return ToObject(items);
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};
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