//Mostly when people are writing loops, it looks like this:

for(var i:int = 0; i < list.length; i++)
{
   var item:MyItem = list[i];
   item.doSomething();
   item.doAnotherThing();
}

//Take a look at the improved loop:

var item:MyItem;
var total:uint = list.length;
for(var i:uint; i < total; i++)
{
   item = list[i] as MyItem;
   item.doSomething();
   item.doAnotherThing();
}

//Want a more freaky way to define the same optimized loop?

for(var i:uint, item:MyItem, total:uint = list.length; i < total; i++)
{
   item = list[i] as MyItem;
   item.doSomething();
   item.doAnotherThing();
}

Optimized Loops

ActionScript 3