JSTests/test262/test/built-ins/Array/prototype/filter/15.4.4.20-10-1.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.filter
es5id: 15.4.4.20-10-1
description: >
    Array.prototype.filter doesn't mutate the Array on which it is
    called on
---*/

  function callbackfn(val, idx, obj)
  {
    return true;
  }
  var srcArr = [1,2,3,4,5];
  srcArr.filter(callbackfn);

assert.sameValue(srcArr[0], 1, 'srcArr[0]');
assert.sameValue(srcArr[1], 2, 'srcArr[1]');
assert.sameValue(srcArr[2], 3, 'srcArr[2]');
assert.sameValue(srcArr[3], 4, 'srcArr[3]');
assert.sameValue(srcArr[4], 5, 'srcArr[4]');