/// Copyright (c) 2012 Ecma International. All rights reserved. /// Ecma International makes this code available under the terms and conditions set /// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the /// "Use Terms"). Any redistribution of this code must retain the above /// copyright and this notice and otherwise comply with the Use Terms. /** * @path ch15/15.4/15.4.4/15.4.4.20/15.4.4.20-9-6.js * @description Array.prototype.filter visits deleted element in array after the call when same index is also present in prototype */ function testcase() { function callbackfn(val, idx, obj) { delete srcArr[2]; delete srcArr[4]; if(val > 0) return true; else return false; } Array.prototype[4] = 5; var srcArr = [1,2,3,4,5]; var resArr = srcArr.filter(callbackfn); delete Array.prototype[4]; if(resArr.length === 4 && resArr[0] === 1 && resArr[3] == 5) // only one element deleted return true; } runTestCase(testcase);