test/built-ins/Array/prototype/filter/15.4.4.20-9-b-11.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: 15.4.4.20-9-b-11
description: >
    Array.prototype.filter - deleting property of prototype causes
    prototype index property not to be visited on an Array
---*/

        function callbackfn(val, idx, obj) {
            return true;
        }
        var arr = [0, , 2];

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

            Array.prototype[1] = 1;
            var newArr = arr.filter(callbackfn);

assert.sameValue(newArr.length, 2, 'newArr.length');
assert.notSameValue(newArr[1], 1, 'newArr[1]');