test262/test/suite/ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-8-b-iii-1-30.js

/// 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 ch15/15.4/15.4.4/15.4.4.21/15.4.4.21-8-b-iii-1-30.js
 * @description Array.prototype.reduce - element changed by getter on current iterations is observed in subsequent iterations on an Array
 */


function testcase() {

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

        var arr = [, , 2];
        var preIterVisible = false;

        Object.defineProperty(arr, "0", {
            get: function () {
                preIterVisible = true;
                return 0;
            },
            configurable: true
        });

        Object.defineProperty(arr, "1", {
            get: function () {
                if (preIterVisible) {
                    return 1;
                } else {
                    return 100;
                }
            },
            configurable: true
        });

        arr.reduce(callbackfn);
        return testResult;
    }
runTestCase(testcase);