test/built-ins/Array/prototype/reduce/15.4.4.21-9-c-ii-8.js


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// Copyright (c) 2012 Ecma International.  All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
esid: sec-array.prototype.reduce
es5id: 15.4.4.21-9-c-ii-8
description: >
    Array.prototype.reduce - element changed by callbackfn on previous
    iterations is observed
---*/

        var result = false;
        function callbackfn(prevVal, curVal, idx, obj) {
            if (idx === 0) {
                obj[idx + 1] = 8;
            }

            if (idx === 1) {
                result = (curVal === 8);
            }
        }

        var obj = { 0: 11, 1: 12, length: 2 };

        Array.prototype.reduce.call(obj, callbackfn, 1);

assert(result, 'result !== true');