Design Patterns

Design Pattern:

What is it? A design pattern is a reusable and general solution to a recurring problem in software design. It represents best practices and provides a template for solving certain types of problems.

Advantages:

Reusability: Design patterns promote reusability by providing tested and proven solutions to common problems.

Scalability: They facilitate scalability by offering a structured approach to design, making it easier to adapt and extend code.

Maintainability: Patterns improve code maintainability by promoting a modular and organized design.

Common Vocabulary: They establish a common vocabulary among developers, fostering better communication and understanding of design choices.

Limitations:

Learning Curve: For developers unfamiliar with patterns, there might be a learning curve to understand and apply them effectively.

Over-Engineering: Applying patterns where they're not needed can lead to unnecessary complexity and over-engineering.

Rigidity: In some cases, patterns can make the code more rigid if not applied judiciously, making it harder to adapt to changes.

Design patterns can be categorized into several groups based on their purpose and the problems they aim to solve. Here are some common categories:

Creational, structural and behavioral patterns.

Creational Patterns:

1. Singleton Pattern
2. Factory Method Pattern
3. Abstract Factory Pattern
4. Builder Pattern
5. Prototype Pattern

Structural Patterns:

1. Adapter Pattern
2. Decorator Pattern
3. Proxy Pattern
4. Bridge Pattern
5. Composite Pattern
6. Facade Pattern
7. Flyweight Pattern

Behavioral Patterns:

1. Observer Pattern
2. Strategy Pattern
3. Command Pattern
4. State Pattern
5. Chain of Responsibility Pattern
6. Visitor Pattern
7. Iterator Pattern
8. Memento Pattern
9. Mediator Pattern

Concurrency Patterns:

1. Singleton Pattern (for concurrent environments)
2. Double-Checked Locking Pattern
3. Thread Pool Pattern
4. Producer-Consumer Pattern

Architectural Patterns:

1. Model-View-Controller (MVC) Pattern
2. Model-View-ViewModel (MVVM) Pattern
3. Layered Architecture Pattern
4. Microservices Pattern
5. Event-Driven Architecture Pattern