Flash / Flex / ActionScript/Array/length

Access the last element of theArray: theArray[theArray.length - 1]

   <source lang="java">

package{

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

       var cities:Array = ["Toronto", "Montreal", "Vancouver", "Waterloo"];
       
       trace(cities); // Toronto,Montreal,Vancouver,Waterloo
   }
 }

}

       </source>
   
  

Determining the Size of an Array

   <source lang="java">

package{

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

       var list:Array = [34, 45, 57];
       trace(list.length);               // Displays: 3
       
       var words:Array = ["this", "that", "the other"];
       trace(words.length);              // Displays: 3
       
       var cards:Array = new Array(24);  
       trace(cards.length);              // Displays: 24
   }
 }

}

       </source>
   
  

Putting an element at index Array .length creates a new element right after the current last element

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var array:Array = new Array();
       
       array.push("val 1", "val 2");
       
       array[array.length] = "val 3";
       
       trace(array);
   }
 }

}

       </source>
   
  

Removing Elements with the length Variable

   <source lang="java">

To delete elements from the end of the array: set the array"s length variable to a number smaller than the current length:

package{

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

       var toppings:Array = ["p", "t", "c", "g", "b"];
       toppings.length = 3;
       trace(toppings);  //p,t,c
   }
 }

}

       </source>
   
  

The length property of an array returns the number of elements in the array.

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var aEmployees:Array = ["A", "P", "C", "H"];
       
       for(var i:Number = 0; i < aEmployees.length; i++) {
         trace(aEmployees[i]);
       }
   }
 }

}

       </source>
   
  

Use the Array constructor allows you to specify the length of the new array.

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var topTen:Array = new Array(10);
       // creates an array with 10 spaces.
       trace(topTen.length);
   }
 }

}

       </source>