ActionScript's Syntax

Declaring variables
Declaring primatives: var variable = 1;
Declaring objects: private var variable:Object = new Object();

• Don't need to specifically type primatives or objects
• Don't need to declare variables (like Perl)
• Variables can be declared Public/Private
• Varaible scope exactly like Java/C++

Declaring loops &logic
For loop: for (var i = 0; i < 10; i++) {}
While loop: while (i < 10) {i++; }

• Syntax exactly like Java/C++
• Variables can be declared inside the for loop heading

If Statements: if (variable == true) {} else if (variable != false) {} else {}

• Syntax exactly like Java/C++

Declaring methods &classes
Methods: private function handleEvent(evtObj:Object):Void {}

• Can be declared public/private
• must use the function keyword
• Can have any number of parameters passed in
• :Void is the return value, can return any primative or object
• If no return value is specified, do not need a return statement

Classes: class BetterForm extends mx.screens.Form {}

• classes are all public
• Can extend (inherit) other classes, but not needed
• Have attributes and methods exactly like Java/C++
• Can self reference by using this keyword

Implementing listeners
Adding a listener: doneButton.addEventListener("click", this);

• 1st parameter: event to listen to
• 2nd parameter: object that is listening

Handling events:
private function handleEvent(evtObj:Object):Void
{
if (evtObj.type == "load")
{
this.load();
}
else if (evtObj.type == "click")
{
this.buttonPressed();
}
}

• All classes that are listening need to implement this method
• Handles all event types in one method