Oct 30 2023
What is the Observer Pattern ?
At its core, the Observer pattern establishes a one-to-many dependency between objects so that when one object (the subject) changes state, all its dependents (observers) are notified and updated automatically. This pattern is ideal for scenarios where an object's state change should trigger specific actions in other parts of the code.
Real use case : Real-Time Dashboard
The Observer Class
In this implementation, we've defined an Observer class with methods to subscribe, unsubscribe, and notify observers.
Integrating the Observer Pattern
Now, let's use the Observer pattern to create a real-time dashboard with three data sources: stock prices, weather updates, and news alerts.
By implementing the Observer pattern, we've achieved a real-time dashboard that updates stock prices, weather conditions, and news alerts as soon as new data is available.
Going further with a more complex example
Benefits of the Observer Pattern
1 - Real-Time Updates: The Observer pattern enables real-time updates across various parts of your application, providing a seamless and responsive user experience.
2 - Decoupled Code: Objects are loosely coupled, making it easy to add or remove observers without affecting other parts of the code.
3 - Customizable Reactions: Observers can define custom reactions to changes, allowing for flexibility and extensibility.