Data Type Flash ActionScript

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  4. It is a good practice to initialize your variables to null when you dont have any other specific value to assign to them
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var myVariable:Number = null;
        trace(myVariable);
        
        var sMessage:String = "Welcome!";
        trace(sMessage);
    }
  }
}