JSTests/test262/test/built-ins/Array/prototype/filter/15.4.4.20-9-c-i-29.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-29
description: >
    Array.prototype.filter - element changed by getter on previous
    iterations is observed on an Array-like object
---*/

        function callbackfn(val, idx, obj) {
            return val === 9 && idx === 1;
        }

        var preIterVisible = false;
        var obj = { length: 2 };

        Object.defineProperty(obj, "0", {
            get: function () {
                preIterVisible = true;
                return 11;
            },
            configurable: true
        });

        Object.defineProperty(obj, "1", {
            get: function () {
                if (preIterVisible) {
                    return 9;
                } else {
                    return 13;
                }
            },
            configurable: true
        });
        var newArr = Array.prototype.filter.call(obj, callbackfn);

assert.sameValue(newArr.length, 1, 'newArr.length');
assert.sameValue(newArr[0], 9, 'newArr[0]');