test/built-ins/Array/prototype/indexOf/15.4.4.14-9-a-16.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-16
description: >
    Array.prototype.indexOf - deleting own property with prototype
    property causes prototype index property to be visited on an Array
---*/

        var arr = [0, 111, 2];

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

            Array.prototype[1] = 1;

assert.sameValue(arr.indexOf(1), 1, 'arr.indexOf(1)');