js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/15.4.4.15-8-a-6.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.lastindexof
description: >
    Array.prototype.lastIndexOf -  deleted properties of step 5 are
    visible here on an Array
---*/

var arr = [];
arr[10] = "10";
arr.length = 20;

var fromIndex = {
  valueOf: function() {
    delete arr[10];
    return 11;
  }
};

assert.sameValue(arr.lastIndexOf("10", fromIndex), -1, 'arr.lastIndexOf("10", fromIndex)');

reportCompare(0, 0);