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55 lines
2.2 KiB
55 lines
2.2 KiB
14 years ago
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// Copyright 2010 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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function IsNull(x) {
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if (x == null) return true; else return false;
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}
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assertTrue(IsNull(null), "null == null");
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assertTrue(IsNull(void 0), "void 0 == null");
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assertFalse(IsNull(42), "42 != null");
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function IsNullStrict(x) {
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if (x === null) return true; else return false;
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}
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assertTrue(IsNullStrict(null), "null === null");
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assertFalse(IsNullStrict(void 0), "void 0 != null");
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assertFalse(IsNullStrict(87), "87 !== null");
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function GimmeFalse(x) {
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if ((x & 1) == null) return true;
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if ((x | 3) === null) return true;
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return false;
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}
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assertFalse(GimmeFalse(1), "GimmeFalse(1)");
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assertFalse(GimmeFalse(null), "GimmeFalse(null)");
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assertFalse(GimmeFalse({}), "GimmeFalse({})");
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