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Edit File: null-compare.js
// Copyright 2010 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. function IsNull(x) { if (x == null) return true; else return false; } assertTrue(IsNull(null), "null == null"); assertTrue(IsNull(void 0), "void 0 == null"); assertFalse(IsNull(42), "42 != null"); function IsNullStrict(x) { if (x === null) return true; else return false; } assertTrue(IsNullStrict(null), "null === null"); assertFalse(IsNullStrict(void 0), "void 0 != null"); assertFalse(IsNullStrict(87), "87 !== null"); function GimmeFalse(x) { if ((x & 1) == null) return true; if ((x | 3) === null) return true; return false; } assertFalse(GimmeFalse(1), "GimmeFalse(1)"); assertFalse(GimmeFalse(null), "GimmeFalse(null)"); assertFalse(GimmeFalse({}), "GimmeFalse({})");