It is a good practice to initialize your variables to null when you don't 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);
    }
  }
}

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1.	To declare a variable using strong typing: var variableName:Datatype;
2.	Once a variable has been declared, you can assign a value to it using a simple assignment statement with an equals sign
3.	You can also declare the variable and assign a value, or initialize the variable, all on one line
4.	Perform operations using variables
5.	You can declare several variables on a single line
6.	Using Access Controls
7.	Overriding Variables
8.	Use the this keyword when referring to an instance variable with the same name as a function variable:
9.	To declare the data type of a variable, use the colon operator right after the name of the variable.
10.	Using Untyped Variables with the Wildcard (*) Data Type

It is a good practice to initialize your variables to null when you don't have any other specific value to assign to them : Variable Declare « Data Type « Flash / Flex / ActionScript

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