35 lines
907 B
JavaScript
35 lines
907 B
JavaScript
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// Copyright 2017 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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// Flags: --allow-natives-syntax
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// Ensure that mutation of the Object.keys result doesn't affect the
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// enumeration cache for fast-mode objects.
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(function() {
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const a = {x:1, y:2};
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let k = Object.keys(a);
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%HeapObjectVerify(k);
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assertEquals(2, k.length);
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assertEquals("x", k[0]);
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assertEquals("y", k[1]);
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k[0] = "y";
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k[1] = "x";
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k = Object.keys(a);
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assertEquals(2, k.length);
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assertEquals("x", k[0]);
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assertEquals("y", k[1]);
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})();
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// Ensure that the copy-on-write keys are handled properly, even in
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// the presence of Symbols.
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(function() {
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const s = Symbol();
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const a = {[s]: 1};
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let k = Object.keys(a);
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%HeapObjectVerify(k);
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assertEquals(0, k.length);
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k.shift();
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assertEquals(0, k.length);
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})();
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