varargs in AS3

ref:
http://weblog.mrinalwadhwa.com/2007/07/19/flex-tip-of-the-day-varargs-in-as3/

// Here’s a bare bone example:

            private function average(... args):Number{

               var sum:Number = 0;
               for(var i:int = 0; i<args.length;i++){

                       sum += args[i];
               }
               return sum/args.length;
            }

// Now all the below calls would work

               var a:Number = average(100,200);

               a = average(100,200,300);
               a = average(100,200,300,400);

               a = average(100,200,300,400,500);