Flash / Flex / ActionScript/Class/Object

Accessing Object Methods

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var sTitle:String = new String("ActionScript ABC");
       var sSubject:String = sTitle.substr(0, 12);
       trace(sSubject);  // Displays: ActionScript
   }
 }

}

       </source>
   
  

Accessing Object Properties

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var sTitle:String = new String("Bible");
       var sName:String = new String("Lott");
       
       trace(sTitle.length);
       
       if(sTitle.length > 12) {
         trace("The title has more than twelve characters.");
       }
   }
 }

}

       </source>
   
  

Creating an Object: var variableName:datatype = new ClassName();

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var oFirstObject:Object = new Object();
       trace(oFirstObject instanceof Object);  // Displays: true
       var sTitle:String = new String("ActionScript Bible");
       trace(sTitle instanceof String);  // Displays: true
   }
 }

}

       </source>
   
  

Removing Properties

   <source lang="java">

The delete operator can be used to remove key-value pairs from an associative array. The delete operator returns true if deletion succeeds.

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var pastas:Object = {t: 2, g: 14, s: 9};
       trace(pastas["s"]); // Displays 9
       delete pastas["s"];
       trace(pastas["s"]); // Displays undefined
   }
 }

}

       </source>
   
  

Testing for Existence

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var notes:Object = {Roger: "hereiam"};
       trace( "Roger" in notes ); // Returns true
       trace( "Josh" in notes); // Returns false
   }
 }

}

       </source>
   
  

Use this operator to investigate instances of classes for methods and public properties

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
        var sprite:Sprite = new Sprite();
        trace("alpha" in sprite); // Displays true
        trace("getChildAt" in sprite); // Displays true
        var person:Person = new Person("Ben");
        trace("name" in person); // Displays true
        trace("SSN" in person); // Displays false
   }
 }

}

class Person
{
    public var name:String;
    private var SSN:Number;
    public function Person(name:String)
    {
        this.name = name;
    }
}
       </source>
   
  

Using Objects as Associative Arrays

   <source lang="java">

package{

 import flash.display.Sprite;
 import flash.utils.Dictionary;
 public class Main extends Sprite{
   public function Main(){
       var guy1:Person = new Person("Roger");
       var guy2:Person = new Person("Mims");
       var girl1:Person = new Person("Ashley");
         var notes:Object = new Object();
         notes["Roger"] = "Likes games";
         notes["Mims"] = "Super organized";
         notes["Ashley"] = "Enjoys drawing";
   }
 }

} class Person{

  public function Person(string:String){
  }

}

       </source>
   
  

Using the dot (.) operator to create the same variable causes an error because it violates the syntactic rules for identifiers:

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var info:Object = new Object(  );
       info["411"] = "Information Line";
       
       var info:Object = new Object(  );
       info.411 = "Information Line";  // ERROR! Identifiers must not start
   }
 }

}

       </source>