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September 14, 2020 10:42
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'use strict';
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var GetIntrinsic = require('../GetIntrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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var getIteratorMethod = require('../helpers/getIteratorMethod');
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var AdvanceStringIndex = require('./AdvanceStringIndex');
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var Call = require('./Call');
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var GetMethod = require('./GetMethod');
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var IsArray = require('./IsArray');
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var Type = require('./Type');
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// https://ecma-international.org/ecma-262/6.0/#sec-getiterator
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module.exports = function GetIterator(obj, method) {
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var actualMethod = method;
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if (arguments.length < 2) {
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actualMethod = getIteratorMethod(
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{
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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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obj
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);
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}
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var iterator = Call(actualMethod, obj);
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if (Type(iterator) !== 'Object') {
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throw new $TypeError('iterator must return an object');
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}
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return iterator;
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};