js/src/tests/test262/built-ins/Array/prototype/reduce/15.4.4.21-9-6.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.reduce
description: >
    Array.prototype.reduce visits deleted element in array after the
    call when same index is also present in prototype
---*/

function callbackfn(prevVal, curVal, idx, obj)
{
  delete arr[3];
  delete arr[4];
  return prevVal + curVal;
}

Array.prototype[4] = 5;
var arr = ['1', 2, 3, 4, 5];
var res = arr.reduce(callbackfn);
delete Array.prototype[4];

//one element acually deleted
assert.sameValue(res, "1235", 'res');

reportCompare(0, 0);