var n:Number = 100000;
  var time:Number = getTimer();
  for(var i:Number=n; i>0; i--){
  }
  trace("empty time used : " + (getTimer() - time));
  time = getTimer();
  for(var i:Number=n; i>0; i--){
   var arr:Array = new Array();
  }
  trace((getTimer() - time) + " ms used : new Array() 100,000 times.");
  time = getTimer();
  for(var i:Number=n; i>0; i--){
   var arr2:Array = [];
  }
  trace((getTimer() - time) + " ms used : [] 100,000 times.");
  time = getTimer();
  for(var i:Number=n; i>0; i--){
   var obj:Object = new Object();
  }
  trace((getTimer() - time) + " ms used : new Object() 100,000 times.");
  time = getTimer();
  for(var i:Number=n; i>0; i--){
   var obj2:Object = {};
  }
  trace((getTimer() - time) + " ms used : {} 100,000 times.");

-------------------------------------------output----------------------------------------------------

empty time used : 70
713 ms used : new Array() 100,000 times.
478 ms used : [] 100,000 times.
595 ms used : new Object() 100,000 times.
386 ms used : {} 100,000 times.

 

Then you can see, create an array by "[]" is very faster than "new Array()", and create an object by "{}" is very faster than "new Object()" too. :)

 

Why? aren't they same?