Flex How To Call A Function With A Variable Number Of Parameters?

Let's Say I Have This Class:

package{
  import flash.display.Sprite;
  public class Main extends Sprite{
    public function Main(){
        trace(getAverage(1,2,3));
        trace(getAverage(1,2,3,4));
        trace(getAverage(1开发者_如何转开发,2,3,4,5));
    }
    public function getAverage (...numbers) {
      var total = 0;
      for (var i = 0; i < numbers.length; i++) {
        total += numbers [i];
      }
      return total / numbers.length;
    }
  }
}

How do I accomplish the "opposite" of this? Namely, how could I now CALL 'getAverage' with a dynamic number of paraemters?

For instance, if I wanted to do something LIKE:

var r:int=Math.random()*6;
var a:Array=new Array();
for (i:int=0;i<r;i++) {
  a[i]=Math.random()*22;
}
// Now I have 'r' Number Of Parameters Stored In 'a'
//   How Do I Call getAverage, with all the values in 'a'??
//   getAverage(a) isn't right, is it?
//   I'm looking for something similar to getAverage(a[0],a[1],a[...]);

var av:Number=getAverage(???);

What I want to know, is if I have a function that takes a variable number of arguments, that's great, but how can I CALL IT with a variable number of arguments, when that number isn't known at runtime? Possibly it's impossible... I'm just not sure, since 'callLater' seems to be able to take an array and generate a dynamic number of parameters from it somehow...

NOTE: Answers consisting solely of "Why Do You Want To Do This?", will be downvoted.

P.S. This IS NOT about calculating Averages! I REALIZE There Are Way Simpler Ways Of Doing All Of This! (I could just write getAverage to accept a single array as its only parameter) The Above is just an EXAMPLE to Illustrate my Question. HOW TO PASS A DYNAMIC NUMBER OF PARAMETERS TO A FUNCTION?

Is this what you're looking for?

var av:Number = getAverage.apply(null, a);

Dave is correct. You can use the apply method of a function to pass in an Array of arguments.

Here is a better explanation of how it works and what the arguments of apply are: http://www.adobe.com/livedocs/flash/9.0/ActionScriptLangRefV3/Function.html

Also note that you can use the call method to do the same thing but using ...args (comma-delimited list) instead, but apply would be more suitable to your situation.

The problem with your question is that the arguments object is already an Array and using (...args) already provides you with a dynamic way to pass any number of arguments you require. Sorry about the previous answer, wasn't thinking straight...

You can create an array or an object with those parameters and pass that object to that function. That's just normal.

Flash has a rather strong introspection capabilities. So, instead of passing a number of objects, you just pass a single dynamic object with any number of attributes you need:

var ob:Object={arg1:"value1", arg2:8}; 
var arg:String="arg4";
ob["arg3"]=8;
ob[arg]=18;
trace (ob.hasOwnProperty("arg1"));
trace (ob.arg3);
trace (ob.arg4);

That should cover just about any use case you might need. The downside is that this allows for some rather clever and hard to trace bugs. :-)