test/built-ins/Array/prototype/indexOf/15.4.4.14-9-a-15.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.indexof
es5id: 15.4.4.14-9-a-15
description: >
    Array.prototype.indexOf - 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, "0", {
            get: function () {
                delete arr[1];
                return 0;
            },
            configurable: true
        });

            Object.prototype[1] = 1;

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