в 09:19, 26 мая 2010

2010-05-26T09:19:13Z

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2010-05-26T08:15:08Z

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==Checking Equality or Comparing Values==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
trace(5 == 6); // Displays: false
trace(6 == 6); // Displays: true

}
}
}
</source>

==Comparison Operators in Actionscript==



<source lang="java">

Operator Name
== Equals
!= Not equals
> Greater than
< Less than
>= Greater than or equal
<= Less than or equal
</source>

==Equality (==)==



<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");
}
}
}
}
</source>

==Greater Than (>) and Less Than (==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){

var x:int = 0;

var a:int = -1;
var b:int = 0;
var c:int = 1;

trace(x <= a); // Displays: false
trace(x >= a); // Displays: true
trace(x <= b); // Displays: true
trace(x >= b); // Displays: true
trace(x <= c); // Displays: true
trace(x >= c); // Displays: false
}
}
}
</source>

==Not Equal To (!=)==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var weather:String = "rain";

if (weather != "sun") { trace("bringUmbrella"); }
if (!(weather == "sun")) { trace("bringUmbrella"); }

}
}
}
</source>

==Number Comparison==



<source lang="java">

Expression Result
6 == 6 true
6 != 6 false
6 > 6 false
6 < 6 false
6 >= 6 true
6 <= 6 true
</source>

==Strict equality==



<source lang="java">

!== Strict inequality

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var myVariable:Number = 999;
if (myVariable == 4){
trace("if condition true");
}
trace(myVariable);
}
}
}
</source>

==The logical inequality operator (!=) returns false if two values are equal and true if they aren"t.==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
trace(5 != 6); // Displays: true
trace(6 != 6); // Displays: false
}
}
}
</source>

==Two composite items are equal only if they both refer to the identical object==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var arrayOne:Array = new Array("a", "b", "c");

var arrayTwo:Array = arrayOne;
trace(arrayOne == arrayTwo); // Displays: true

}
}
}
</source>

==Use the <= and >= operators to check if one value is less than or equal to, or greater than or equal to, another value:==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
trace(5 <= 6); // Displays: true
trace(5 >= 5); // Displays: true
}
}
}
</source>

==Use the < and > operators to check if one value is less than or greater than another value:==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
trace(5 < 6); // Displays: true
trace(5 > 5); // Displays: false
}
}
}
</source>

==When comparing primitive datatypes, ActionScript compares them by value.==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var quantity:Number = 6;
var total:Number = 6;
trace (quantity == total); // Displays: true
}
}
}
</source>

==When you compare composite datatypes, ActionScript compares them by reference.==



<source lang="java">

package{
import flash.display.Sprite;

public class Main extends Sprite{
public function Main(){
var arrayOne:Array = new Array("a", "b", "c");
var arrayTwo:Array = new Array("a", "b", "c");
trace(arrayOne == arrayTwo); // Displays: false
}
}
}
</source>

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в 09:19, 26 мая 2010

Admin: 1 версия