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Edit File: instanceof.js
// Copyright 2008 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. assertTrue({} instanceof Object); assertTrue([] instanceof Object); assertFalse({} instanceof Array); assertTrue([] instanceof Array); function TestChains() { var A = {}; var B = {}; var C = {}; B.__proto__ = A; C.__proto__ = B; function F() { } F.prototype = A; assertTrue(C instanceof F); assertTrue(B instanceof F); assertFalse(A instanceof F); F.prototype = B; assertTrue(C instanceof F); assertFalse(B instanceof F); assertFalse(A instanceof F); F.prototype = C; assertFalse(C instanceof F); assertFalse(B instanceof F); assertFalse(A instanceof F); } TestChains(); function TestExceptions() { function F() { } var items = [ 1, new Number(42), true, 'string', new String('hest'), {}, [], F, new F(), Object, String ]; var exceptions = 0; var instanceofs = 0; for (var i = 0; i < items.length; i++) { for (var j = 0; j < items.length; j++) { try { if (items[i] instanceof items[j]) instanceofs++; } catch (e) { assertTrue(e instanceof TypeError); exceptions++; } } } assertEquals(10, instanceofs); assertEquals(88, exceptions); // Make sure to throw an exception if the function prototype // isn't a proper JavaScript object. function G() { } G.prototype = undefined; assertThrows("({} instanceof G)"); } TestExceptions();