Flash / Flex / ActionScript/Statement/switch

Adding a break statement to switch statement

 
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var myVariable:Number = 6;
        
        switch(myVariable){
          case 10:
            trace("10");
            break;
          case 6:
            trace("6");
            break;
          case 1:
            trace("1");
        }
        
    }
  }
}
6

Adding a default statement

 

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var myVariable:Number = 6;
        
        switch(myVariable){
          case 10:
            trace("10");
            break;
          case 6:
            trace("6");
            break;
          case 1:
            trace("1");
            break;
          default:
            trace("none of the cases were met");
        }
   
    }
  }
}

switch statement executes one of several possible code blocks based on the value of a single test expression

 

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var greeting;
        
        var language = "english";
        
        switch (language) {
          case "english":
            greeting = "Hello";
            break;
        
          case "japanese":
            greeting = "Konnichiwa";
            break;
        
          case "french":
            greeting = "Bonjour";
            break;
        
          case "german":
            greeting = "Guten tag";
            break;
        
          default:
            // Code here (not shown) would display an error message indicating
            // that the language was not set properly
        }
        trace(greeting);
    }
  }
}

The general form of a switch statement

 
switch (testExpression) {
  case caseExpression:
    // case body
  case caseExpression:
    // case body
  default:
    // case body
}

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var animalName:String = "dove";
        switch (animalName) {
          case "turtle":
            trace("Yay! "Turtle" is the correct answer.");
          case "dove":
            trace("Sorry, a dove is a bird, not a reptile.");
          default:
            trace("Sorry, try again.");
        }
    }
  }
}

The switch statement is useful when performing the same action for one of several matching possibilities.

 

package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){

        var animalName:String = "dove";
        
        switch (animalName) {
          case "turtle":
          case "iguana":
            trace("Yay! You named a reptile.");
            break;
          case "dove":
          case "cardinal":
            trace("Sorry, you specified a bird, not a reptile.");
            break;
          default:
            trace("Sorry, try again.");
        }
    }
  }
}

Working with the switch Statement

 
//The basic structure of a switch statement is:
/*
switch(expression){
  case testExpression:
    statement;
  [case testExpression2:
    statement;
  default:
    statement;]
}
*/
package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var myVariable:Number = 6;
        switch(myVariable){
          case 10:
            trace("10");
          case 6:
            trace("6");
          case 1:
            trace("1");
        }
    }
  }
}
6
1