Advantage of Observer Method Design Pattern

The primary advantage of the Observer Pattern lies in its ability to establish a loosely coupled design between the subject (the object that is being observed) and its observers (the objects that are interested in its state). Here are some key advantages:

• Loose Coupling: The Observer Pattern promotes loose coupling between the subject and its observers. The subject doesn’t need to know anything about the observers, and vice versa. This makes it easier to make changes to either the subject or the observers without affecting the other.
• Modular Design: Because of the loose coupling, the components (subject and observers) can be developed and modified independently. This leads to a more modular and maintainable design.
• Reusability: Since observers are independent components, they can be reused in different contexts. we can have different observers reacting to the same subject in different ways, depending on the requirements.
• Extensibility: It’s easy to add or remove observers without modifying the subject. This makes the system more extensible, allowing for dynamic changes in the number and types of observers.
• Broadcast Communication: The pattern enables a “broadcast” communication mechanism. When the state of the subject changes, all registered observers are automatically notified. This is particularly useful in scenarios where multiple objects need to react to changes in another object.
• Support for Event Handling: The Observer Pattern is commonly used in event handling systems. Events are essentially changes in state, and the observer pattern provides a way to handle and respond to these events.
• Reduction of Dependencies: By using the Observer Pattern, dependencies between objects are minimized. This reduction in dependencies can lead to a more flexible and maintainable codebase.

Observer Design Pattern is a behavioral design pattern where an object, known as the subject, maintains a list of its dependents, called observers, that are notified of any changes in the subject’s state. This pattern is often used to implement distributed event handling systems.