besen array test.js

"use strict";

(function()
{
  var _warmUp = function()
  {
    var d = Date.now();
      
    while(Date.now() - d < 4000)
    {
      var i = 1e6; while(i-- >= 0);
    }
  };
  
  var _test = function(n, a)
  {
    var j = n; while(j-- >= 0)
    {  
      var i = a.length; while(i-- >= 0)
        a[i] = i;
    }
  };
  
  _warmUp();
  
  var d = Date.now();
  _test(1000, new Array(1000));
  trace('array', Date.now() - d);

  var d = Date.now();
  _test(1000, {length: 1000});
  trace('object', Date.now() - d);
})();

// array 7100
// object 4887