JSTests/test262/test/built-ins/Array/prototype/filter/15.4.4.20-9-c-ii-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.filter
es5id: 15.4.4.20-9-c-ii-2
description: Array.prototype.filter - callbackfn takes 3 arguments
---*/

  var parCnt = 3;
  var bCalled = false
  function callbackfn(val, idx, obj)
  {
    bCalled = true;
    if(arguments.length !== 3)
      parCnt = arguments.length;   //verify if callbackfn was called with 3 parameters
  }

  var srcArr = [0,1,2,3,4,5,6,7,8,9];
  var resArr = srcArr.filter(callbackfn);

assert.sameValue(bCalled, true, 'bCalled');
assert.sameValue(parCnt, 3, 'parCnt');