test/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-a-15.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25

// 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.lastindexof
es5id: 15.4.4.15-8-a-15
description: >
    Array.prototype.lastIndexOf -  deleting own property with
    prototype property causes prototype index property to be visited
    on an Array-like object
---*/

        var arr = { 0: 0, 1: 111, 2: 2, length: 10 };

        Object.defineProperty(arr, "6", {
            get: function () {
                delete arr[1];
                return 0;
            },
            configurable: true
        });

            Object.prototype[1] = 1;

assert.sameValue(Array.prototype.lastIndexOf.call(arr, 1), 1, 'Array.prototype.lastIndexOf.call(arr, 1)');