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in this video im going to show you how to use the observer pattern to create better separation between various modules in your code this pattern allows you to do some really cool things im going to show you an example the observer pattern also called the listener sometimes is actually a classic from the gang of four book on design patterns heres a class diagram the important thing to note is that there are two roles the subject and the observer the subject does things and changes things and notifies observers of any changes that happened theres several variations of this pattern in this video im actually not going to implement exactly the classical object-oriented version of it but you commonly see it in event management systems and this is also the way that most developers use this pattern handle user interface or general system events this is a pity because the pattern can be very powerful and work for you and im going to show you how to use that t