JSTests/test262/test/built-ins/Array/prototype/forEach/15.4.4.18-2-3.js

// 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.foreach
es5id: 15.4.4.18-2-3
description: >
    Array.prototype.forEach - 'length' is an own data property that
    overrides an inherited data property on an Array-like object
---*/

        var result = false;
        function callbackfn(val, idx, obj) {
            result = (obj.length === 2);
        }

        var proto = { length: 3 };

        var Con = function () { };
        Con.prototype = proto;

        var child = new Con();
        child.length = 2;
        child[0] = 12;
        child[1] = 11;
        child[2] = 9;

        Array.prototype.forEach.call(child, callbackfn);

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