mirror of https://github.com/tc39/test262.git
42 lines
1.0 KiB
JavaScript
42 lines
1.0 KiB
JavaScript
// Copyright (C) 2013 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-getiterator
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description: >
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The iterator's `next` method should be accessed only once with each
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iteration as per the `GetIterator` abstract operation (7.4.1).
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features: [Symbol.iterator, for-of]
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---*/
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var iterable = {};
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var iterator = {};
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var iterationCount = 0;
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var loadNextCount = 0;
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iterable[Symbol.iterator] = function() {
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return iterator;
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};
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function next() {
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if (iterationCount) return { done: true };
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return { value: 45, done: false };
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}
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Object.defineProperty(iterator, 'next', {
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get() { loadNextCount++; return next; },
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configurable: true
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});
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for (var x of iterable) {
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assert.sameValue(x, 45);
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Object.defineProperty(iterator, 'next', {
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get: function() {
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throw new Test262Error(
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'Should not access the `next` method after the iteration prologue.');
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}
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});
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iterationCount++;
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}
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assert.sameValue(iterationCount, 1);
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assert.sameValue(loadNextCount, 1);
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