JSTests/test262/test/built-ins/Array/prototype/filter/15.4.4.20-9-c-i-5.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.filter
es5id: 15.4.4.20-9-c-i-5
description: >
    Array.prototype.filter - element to be retrieved is own data
    property that overrides an inherited accessor property on an
    Array-like object
---*/

        function callbackfn(val, idx, obj) {
            return idx === 0 && val === 11;
        }

        var proto = {};

        Object.defineProperty(proto, "0", {
            get: function () {
                return 5;
            },
            configurable: true
        });

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

        var child = new Con();
        child.length = 2;
        Object.defineProperty(child, "0", {
            value: 11,
            configurable: true
        });
        child[1] = 12;

        var newArr = Array.prototype.filter.call(child, callbackfn);

assert.sameValue(newArr.length, 1, 'newArr.length');
assert.sameValue(newArr[0], 11, 'newArr[0]');