JSTests/test262/test/built-ins/Array/prototype/map/15.4.4.19-8-2.js

// 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.map
es5id: 15.4.4.19-8-2
description: >
    Array.prototype.map considers new value of elements in array after
    it is called
---*/

  function callbackfn(val, idx, obj)
  {
    srcArr[4] = -1;
    if(val > 0)
      return 1;
    else
      return 0;
  }

  var srcArr = [1,2,3,4,5];
  var resArr = srcArr.map(callbackfn);

assert.sameValue(resArr.length, 5, 'resArr.length');
assert.sameValue(resArr[4], 0, 'resArr[4]');