test/built-ins/Array/prototype/reduceRight/15.4.4.22-9-c-i-20.js


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// 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.

/*---
es5id: 15.4.4.22-9-c-i-20
description: >
    Array.prototype.reduceRight - element to be retrieved is own
    accessor property without a get function that overrides an
    inherited accessor property on an Array
includes: [runTestCase.js]
---*/

function testcase() {

        var testResult = false;
        function callbackfn(prevVal, curVal, idx, obj) {
            if (idx === 1) {
                testResult = (typeof curVal === "undefined");
            }
        }

        try {
            Array.prototype[1] = 1;
            var arr = [0, ,2];
            Object.defineProperty(arr, "1", {
                set: function () { },
                configurable: true
            });

            arr.reduceRight(callbackfn, "initialValue");
            return testResult;

        } finally {
            delete Array.prototype[1];
        }
    }
runTestCase(testcase);