в 09:19, 26 мая 2010

2010-05-26T09:19:12Z

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2010-05-26T08:14:46Z

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==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>

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в 09:19, 26 мая 2010

Admin: 1 версия