test/built-ins/Array/prototype/filter/15.4.4.20-2-5.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.filter
es5id: 15.4.4.20-2-5
description: >
    Array.prototype.filter to Array-like object, 'length' is an own
    data property that overrides an inherited accessor property
---*/

        function callbackfn(val, idx, obj) {
            return obj.length === 2;
        }

        var proto = {};

        Object.defineProperty(proto, "length", {
            get: function () {
                return 3;
            },
            configurable: true
        });

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

        var child = new Con();
        Object.defineProperty(child, "length", {
            value: 2,
            configurable: true
        });
        child[0] = 12;
        child[1] = 11;
        child[2] = 9;

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

assert.sameValue(newArr.length, 2, 'newArr.length');