Ruby-like Question: Make this function shorter (ActionScript 3)

Question

I just wrote this incredibly verbose code to turn numbers like 2 into 02. Can you make this function shorter, please (maintaning the functionality)?

Answer 1

Christophe Herreman almost got it right, but his method adds more zeroes and not the differential amount. I fixed it a bit:

public static function format(n:int, minimumLength:int):String {
  var v:String = n.toString();
  var stillNeed:int = minimumLength - v.length;       
  return (stillNeed > 0) ? v : String(Math.pow(10, stillNeed) + v).substr(1);
}

My earlier try:

 public static function format(n:int, minimumLength:int):String {
    var stillNeed:int = minimumLength - n.toString().length;               
    return (n.split("").reverse().join("") as int) // 32 -> 23
             *Math.pow(10, stillNeed > 0 ? stillNeed : 0).toString() // 23000
                 .split("").reverse().join("");  // 00032
 }

 public static function formatAny(n:Number, minimumLength:int):String {
    return format((int)n) + n.toString().split('.')[ 1 ];
 }

 // use this if you want to handle -ve numbers as well
 public static function formatAny(n:Number, minimumLength:int):String {
    return (n < 0 ? '-' : '') + formatAny(n, minimumLength);
 }