test/built-ins/Array/prototype/reduce/15.4.4.21-9-b-25.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-b-25
description: >
    Array.prototype.reduce - deleting own property with prototype
    property causes prototype index property to be visited on an
    Array-like object
---*/

        var testResult = false;

        function callbackfn(accum, val, idx, obj) {
            if (idx === 1 && val === 1) {
                testResult = true;
            }
        }

        var obj = { 0: 0, 1: 111, 4: 10, length: 10 };

        Object.defineProperty(obj, "0", {
            get: function () {
                delete obj[1];
                return 0;
            },
            configurable: true
        });

            Object.prototype[1] = 1;
            Array.prototype.reduce.call(obj, callbackfn, "initialValue");

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