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Edit File: array-length-number-conversion.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. // A reduced test case from Acid3 test 95. // When an object is assigned to an array length field, // it is converted to a number. function CheckSetArrayLength(x, expected) { var a = []; a.length = x; assertEquals("number", typeof a.length); assertEquals(expected, a.length); } CheckSetArrayLength(2147483648, 2147483648); CheckSetArrayLength("2147483648", 2147483648); CheckSetArrayLength(null, 0); CheckSetArrayLength(false, 0); CheckSetArrayLength(true, 1); CheckSetArrayLength({valueOf : function() { return 42; }}, 42); CheckSetArrayLength({toString : function() { return '42'; }}, 42); // Test invalid values assertThrows("var y = []; y.length = 'abc';"); assertThrows("var y = []; y.length = undefined;"); assertThrows("var y = []; y.length = {};"); assertThrows("var y = []; y.length = -1;"); assertThrows("var y = []; y.length = {valueOf:function() { throw new Error(); }};");