Introduction to Design Patterns


Creating efficient, reusable code is a key goal for all developers, especially when working on large-scale applications. A well-organized code structure is essential to avoid duplication when performing similar tasks. However, extending and adding new features to an existing system can be quite challenging, as developers must fully understand the system’s intricacies—such as the relationships between entities and the hierarchy they follow. Additionally, code should be designed to accommodate future changes with minimal effort. In these situations, having a structured approach to addressing common challenges becomes invaluable. This is where design patterns come into play.

Design patterns are standard solutions to common software design problems that developers encounter. They represent best practices and reusable approaches that help in solving recurring design issues in software architecture. Design patterns are not actual code implementations but templates or guidelines on how to structure code to achieve particular design goals.

What to observe for a Design Pattern?

Advantages of Design Patterns

Consequences of Unfamiliarity with Design Patterns

Classification of Design Patterns

1. Creational Design Patterns

Creational patterns deal with object creation mechanisms. They abstract the instantiation process to make the system independent of how objects are created.


2. Structural Design Patterns

Structural patterns deal with object composition, helping structure classes and objects to form larger systems. They focus on the relationship between entities.


3. Behavioral Design Patterns

Behavioral patterns focus on communication between objects, managing how objects interact with each other in a system.


4. Architectural Design Patterns

Architectural patterns deal with the high-level structure of the entire system, ensuring scalability, maintainability, and robustness.