The Observer pattern, also known as the Publish-Subscriber pattern, is one of the behavioral design patterns that defines a one-to-many relationship between objects. For example, when the state of one object, Subject, changes, all its dependents, Observers, are notified and updated automatically by calling their methods.
Mainly, this pattern is used to implement distributed event handling systems. It is also a key part in the Model-View-Controller (MVC) architectural pattern.
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