5edec0e39a
PR-URL: https://github.com/nodejs/node/pull/55014 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
29 lines
890 B
JavaScript
29 lines
890 B
JavaScript
// Copyright 2016 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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// Create a prototype object which has a lot of fast properties.
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var body = "";
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for (var i = 0; i < 100; i++) {
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body += `this.a${i} = 0;\n`;
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}
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var Proto = new Function(body);
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function A() {}
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A.prototype = new Proto();
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// Create an object and add properties that already exist in the prototype.
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// At some point the object will turn into a dictionary mode and one of
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// the fast details from the prototype will be reinterpreted as a details
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// for a new property ...
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var o = new A();
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for (var i = 0; i < 100; i++) {
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o["a" + i] = i;
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}
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// ... which will break the enumeration order of the slow properties.
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var names = Object.getOwnPropertyNames(o);
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for (var i = 0; i < 100; i++) {
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assertEquals("a" + i, names[i]);
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}
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