Flash / Flex / ActionScript/Data Type/null

Checking for Null Values

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var weather:String = "rain";
       
       if (weather != null) { trace("checkWeather"); }
       
       if (weather) { trace("checkWeather"); }
   }
 }

}

       </source>
   
  

Convert null to string

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       trace(null); // null
   }
 }

}

       </source>
   
  

If statement ladder

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var weather:String = "rain";
       
       if (weather == "rain") {
          trace("bringUmbrella");
       } else if (weather == "snow"){
          trace("bringCoat");
       } else if (weather == "sun") {
          trace("bringSunscreen");
       }
   }
 }

}

       </source>