Flash / Flex / ActionScript/Data Type/Number

Casting to a Number: Number(stringValue)

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var nOne:Number = Number("468");    // 468
       var nTwo:Number = Number("23.45");  // 23.45
       var nThree:Number = Number("abc");    // NaN (Not a Number)
       var nFour:Number = Number("0101");   // 65 (Octal)
   }
 }

}

       </source>
   
  

Dealing with Infinite Values: Number.POSITIVE_INFINITY and Number.NEGATIVE_INFINITY

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       trace(isFinite(10));  // Displays: true
       trace(isFinite(Number.POSITIVE_INFINITY));   // Displays: false

   }
 }

}

       </source>
   
  

Decimal Numbers

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var nDecimalOne:Number = 1.23e+2;  // results in 123
       var nDecimalTwo:Number = 1.23e-2;  // results in 0.0123
       
       trace(nDecimalOne);
       trace(nDecimalTwo);
   }
 }

}

       </source>
   
  

Handling Minimum and Maximum Values: MAX_VALUE and MIN_VALUE

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       trace(Number.MAX_VALUE);
       trace(Number.MIN_VALUE);
   }
 }

} 1.79769313486231e+308 4.9406564584124654e-324

       </source>
   
  

Minimum and Maximum Values for uint and int

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
     trace(uint.MIN_VALUE); //0
     trace(uint.MAX_VALUE); //4294967295
     trace(int.MIN_VALUE); //-2147483648
     trace(int.MAX_VALUE); //2147483647
     trace(Number.MIN_VALUE); //4.9406564584124654e-324
     trace(Number.MAX_VALUE); //1.79769313486231e+308
 
   }
 }

}

       </source>
   
  

Not a Number: use the top-level function isNaN()

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
        var n:Number;
        trace(n); //NaN
        trace(isNaN(n)); //true
        trace(n == NaN); //false! That"s why you use isNaN()
        n = Number("this won"t convert into a number");
        trace(isNaN(n)); //true
        n = 10;
        trace(isNaN(n)); //false
   }
 }

}

       </source>
   
  

Read and write to a variable

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var myVariable:Number = 15; // Write
       trace(myVariable);          // Read
       myVariable = 16;            // Write again
       trace(myVariable);          // Read again
   }
 }

}

       </source>
   
  

The default value for an unassigned variable of type Number is NaN

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
        var n:Number;
        trace(n); // NaN
        n = 12;
        trace(n); // 12
   }
 }

}

       </source>
   
  

Use Number type variable in for loop

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       for (var i:Number = 25; i > 0; i--){
         trace(i);
       } 
   }
 }

} 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

       </source>
   
  

Working with Number Instances

   <source lang="java">

package{

 import flash.display.Sprite;
 
 public class Main extends Sprite{
   public function Main(){
       var nInstance:Number = new Number(11);
       var nVal:Number = new Number(123);
       trace(nVal.toString(16));  // Displays: 7b
   }
 }

}

       </source>