Array Flash ActionScript

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var aEmployees:Array = new Array(4);
        aEmployees[0] = "A";
        aEmployees[1] = "P";
        aEmployees[2] = "C";
        aEmployees[3] = "H";
        
        aEmployees[9] = "Ruth";
        
        
        trace(aEmployees.toString());  //A,P,C,H,,,,,,Ruth
    }
  }
}