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docs: add real-world example to Observer pattern README #3376

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docs: add real-world example to Observer pattern README #3376

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Expand Up @@ -209,3 +209,10 @@ Trade-offs:
* [Head First Design Patterns: Building Extensible and Maintainable Object-Oriented Software](https://amzn.to/49NGldq)
* [Pattern-Oriented Software Architecture Volume 1: A System of Patterns](https://amzn.to/3xZ1ELU)
* [Refactoring to Patterns](https://amzn.to/3VOO4F5)

## Real-World Example

The Observer pattern is widely used in event-driven architectures.
For instance, in Java Swing or JavaFX applications, UI components can register listeners
to react to user actions without tightly coupling the business logic to the interface.
This makes the system more modular and easier to extend.
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