29 lines
886 B
JavaScript
29 lines
886 B
JavaScript
'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 isObject = require('../helpers/isObject');
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var isIteratorRecord = require('../helpers/records/iterator-record');
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// https://262.ecma-international.org/15.0/#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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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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if (!isObject(result)) {
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throw new $TypeError('iterator next must return an object'); // step 3
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}
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return result; // step 4
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};
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