/// 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 ch15/15.4/15.4.4/15.4.4.19/15.4.4.19-8-b-14.js * @description Array.prototype.map - decreasing length of array causes index property not to be visited */ function testcase() { function callbackfn(val, idx, obj) { return idx === 3 && typeof val === "undefined"; } var arr = [0, 1, 2, "last"]; Object.defineProperty(arr, "0", { get: function () { arr.length = 3; return 0; }, configurable: true }); var testResult = arr.map(callbackfn); return typeof testResult[3] === "undefined"; } runTestCase(testcase);