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36 lines
1.1 KiB
36 lines
1.1 KiB
'use strict'; |
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var $TypeError = require('es-errors/type'); |
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var isObject = require('es-object-atoms/isObject'); |
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var Call = require('./Call'); |
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var isIteratorRecord = require('../helpers/records/iterator-record'); |
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// https://262.ecma-international.org/16.0/#sec-iteratornext |
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module.exports = function IteratorNext(iteratorRecord) { |
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if (!isIteratorRecord(iteratorRecord)) { |
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throw new $TypeError('Assertion failed: `iteratorRecord` must be an Iterator Record'); // step 1 |
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} |
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var result; |
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try { |
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if (arguments.length < 2) { // step 1 |
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result = Call(iteratorRecord['[[NextMethod]]'], iteratorRecord['[[Iterator]]']); // step 1.a |
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} else { // step 2 |
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result = Call(iteratorRecord['[[NextMethod]]'], iteratorRecord['[[Iterator]]'], [arguments[1]]); // step 2.a |
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} |
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} catch (e) { // step 3 |
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// eslint-disable-next-line no-param-reassign |
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iteratorRecord['[[Done]]'] = true; // step 3.a |
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throw e; // step 3.b |
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} |
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if (!isObject(result)) { // step 5 |
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// eslint-disable-next-line no-param-reassign |
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iteratorRecord['[[Done]]'] = true; // step 5.a |
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throw new $TypeError('iterator next must return an object'); // step 5.b |
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} |
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return result; // step 6 |
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};
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