JSTests/test262/test/built-ins/Array/prototype/filter/15.4.4.20-9-c-i-20.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-20
description: >
    Array.prototype.filter - element to be retrieved is own accessor
    property without a get function that overrides an inherited
    accessor property on an Array
---*/

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

        var arr = [];

        Object.defineProperty(arr, "0", {
            set: function () { },
            configurable: true
        });

            Array.prototype[0] = 100;
            var newArr = arr.filter(callbackfn);

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