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72 lines
2.5 KiB
72 lines
2.5 KiB
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --legacy-const
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// Test const properties and pre/postfix operation.
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function f() {
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const x = 1;
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x++;
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assertEquals(1, x);
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x--;
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assertEquals(1, x);
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++x;
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assertEquals(1, x);
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--x;
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assertEquals(1, x);
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assertEquals(1, x++);
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assertEquals(1, x--);
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assertEquals(2, ++x);
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assertEquals(0, --x);
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}
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f();
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// Test that the value is read eventhough assignment is disallowed.
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// Spidermonkey does not do this, but it seems like the right thing to
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// do so that 'o++' is equivalent to 'o = o + 1'.
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var valueOfCount = 0;
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function g() {
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const o = { valueOf: function() { valueOfCount++; return 42; } };
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assertEquals(42, +o);
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assertEquals(1, valueOfCount);
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o++;
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assertEquals(42, +o);
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assertEquals(3, valueOfCount);
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++o;
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assertEquals(42, +o);
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assertEquals(5, valueOfCount);
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o--;
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assertEquals(42, +o);
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assertEquals(7, valueOfCount);
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--o;
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assertEquals(42, +o);
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assertEquals(9, valueOfCount);
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}
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g();
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