29 lines
724 B
JavaScript
29 lines
724 B
JavaScript
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'use strict';
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var $TypeError = require('es-errors/type');
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var Call = require('./Call');
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var Get = require('./Get');
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var IsCallable = require('./IsCallable');
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var Type = require('./Type');
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// https://262.ecma-international.org/15.0/#sec-getiteratorfrommethod
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module.exports = function GetIteratorFromMethod(obj, method) {
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if (!IsCallable(method)) {
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throw new $TypeError('method must be a function');
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}
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var iterator = Call(method, obj); // step 1
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if (Type(iterator) !== 'Object') {
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throw new $TypeError('iterator must return an object'); // step 2
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}
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var nextMethod = Get(iterator, 'next'); // step 3
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return { // steps 4-5
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'[[Iterator]]': iterator,
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'[[NextMethod]]': nextMethod,
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'[[Done]]': false
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};
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};
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