// Instead of...
var someThing:SomeClass;
for (var i:Number = 0; i < someArray.length; i++)
{
    someThing = someArray[i] as SomeClass;
    // Do stuff with someThing...
}


// Do this:
someArray.forEach = _doSomething;

private function _doSomething(element:*, index:int, arr:Array):void
{
    var someThing:SomeClass = element as SomeClass;
    // Do stuff with someThing
}