Object-Oriented ActionScript 3.0

Object-Oriented ActionScript 3.0 Peter Elst 4th-6th June 2008 Edinburgh, Scotland

Object-Oriented Programming ■ Difficult ■ Scary ■ Overhead ■ Only for large teams 4th-6th June 2008 Edinburgh, Scotland

Object-Oriented Programming ■ Difficult? Structured code ■ Scary ■ Overhead ■ Only for large teams 4th-6th June 2008 Edinburgh, Scotland

Object-Oriented Programming ■ Difficult? Structured code ■ Scary? Initial learning curve ■ Overhead ■ Only for large teams 4th-6th June 2008 Edinburgh, Scotland

Object-Oriented Programming ■ Difficult? Structured code ■ Scary? Initial learning curve ■ Overhead? Promotes code reuse ■ Only for large teams 4th-6th June 2008 Edinburgh, Scotland

Object-Oriented Programming ■ Difficult? Structured code ■ Scary? Initial learning curve ■ Overhead? Promotes code reuse ■ Only for large teams? Useful for anyone 4th-6th June 2008 Edinburgh, Scotland

Classes (the artist formerly known as prototype) ■ The way things were: function Conference() { this.name = quot;Flashforwardquot;; } Conference.prototype.getName = function() { trace(quot;conference name: quot;+this.name); } var myConference = new Conference(); myConference.getName(); 4th-6th June 2008 Edinburgh, Scotland

Classes (the artist formerly known as prototype) ■ The way things are: package { public class Conference { public var name:String = quot;Flashforwardquot;; public function getName():void { trace(quot;conference name: quot;+this.name); } } } 4th-6th June 2008 Edinburgh, Scotland

Instances ■ Classes provide a blueprint ■ Instances set their values for properties 4th-6th June 2008 Edinburgh, Scotland

Inheritance (getting rich the easy way) ■ Classes can extend each-other ■ Avoids code duplication ■ Properties and methods can be overridden package { public class SuperClass extends BaseClass { public function SuperClass() { super(); } } } 4th-6th June 2008 Edinburgh, Scotland

Inheritance vs composition ■ Inheritance deals with an is a relationship ■ Composition is used for has a relationships Employee is a Person Employee has a Job 4th-6th June 2008 Edinburgh, Scotland

Encapsulation (don't touch my stuff) ■ Protect the inner workings of your code through the use of access modifiers ■ Provide an API for other classes to use by providing getter/setter methods public - anything can access this private - only the class itself can access protected - class and its subclasses can access internal (default) - all classes in the same class package 4th-6th June 2008 Edinburgh, Scotland

Polymorphism (copycat behavior) ■ Have classes use the same method names ■ Allows classes to be swapped at runtime ■ Same name but different implementation Doctor.work() Fireman.work() WebDeveloper.work() 4th-6th June 2008 Edinburgh, Scotland

Interfaces (sign on the dotted line) ■ Classes can use one or more interfaces ■ Interfaces require a class to implement a specific set of methods ■ Used to formalize polymorphism ■ Interfaces can extend each-other 4th-6th June 2008 Edinburgh, Scotland

Design Patterns General solutions to common problems 4th-6th June 2008 Edinburgh, Scotland

Observer pattern ■ Problem: notify other classes when an update occurs in a data model ■ Solution: keep an array of all instances that want to be notified and call their update method then the model has changed 4th-6th June 2008 Edinburgh, Scotland

Singleton pattern ■ Problem: allow only one instance of a class to exist in an application ■ Solution: prevent the constructor from being called outside of the class scope and provide a static method for returning the single class instance 4th-6th June 2008 Edinburgh, Scotland

Want to learn more? Books ■ Object-Oriented ActionScript 3.0 ■ Essential ActionScript 3.0 Course ■ Core ActionScript 3.0 (Skills Matter - London) 4th-6th June 2008 Edinburgh, Scotland

Thanks! 4th-6th June 2008 Edinburgh, Scotland

Get in touch! Peter Elst Flash Platform Consultant Blog: www.peterelst.com Email: training@peterelst.com LinkedIn: www.linkedin.com/in/peterelst Twitter: www.twitter.com/peterelst 4th-6th June 2008 Edinburgh, Scotland

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Object-Oriented ActionScript 3.0

by Peter Elst on May 31, 2008

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