test/built-ins/Array/prototype/reduce/15.4.4.21-9-9.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: 15.4.4.21-9-9
description: >
    Array.prototype.reduce - modifications to length don't change
    number of iterations in step 9
includes: [runTestCase.js]
---*/

function testcase() {
        var called = 0;
        function callbackfn(accum, val, idx, obj) {
            called++;
            return accum + val;
        }

        var arr = [0, 1, 2, 3];
        Object.defineProperty(arr, "0", {
            get: function () {
                arr.length = 2;
                return 0;
            },
            configurable: true
        });

        var newAccum = arr.reduce(callbackfn, "initialValue");

        return newAccum === "initialValue01" && called === 2;
    }
runTestCase(testcase);