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PR-URL: https://github.com/nodejs/node/pull/47251 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com> Reviewed-By: Richard Lau <rlau@redhat.com>
32 lines
849 B
JavaScript
32 lines
849 B
JavaScript
// Copyright 2023 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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//
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// Flags: --harmony-iterator-helpers
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assertEquals('function', typeof Iterator);
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assertEquals(0, Iterator.length);
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assertEquals('Iterator', Iterator.name);
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// Abstract base class, can't be instantiated.
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assertThrows(() => new Iterator(), TypeError);
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// Can be used as superclass though.
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class MyIterator extends Iterator {
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next() {
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return {value: 42, done: false};
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}
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}
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const myIter = new MyIterator();
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assertTrue(myIter instanceof MyIterator);
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function* gen() {
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yield 42;
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}
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const genIter = gen();
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assertTrue(genIter instanceof Iterator);
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assertSame(
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Object.getPrototypeOf(
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Object.getPrototypeOf(Object.getPrototypeOf(genIter))),
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Iterator.prototype);
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