Introduction

This article introduces design patterns, reusable solutions to common software development problems. Design patterns help us structure our code and make it more maintainable.

Why Design Patterns?

• Maintainability: Software is constantly evolving. Design patterns help us write code that is easier to modify and update.
• Communication: Design patterns provide a common language for developers to discuss software design.

Types of Design Patterns

There are three main categories of design patterns:

1. Creational Patterns: These patterns hide the details of object creation.
2. Structural Patterns: These patterns focus on how classes and objects are structured and composed.
3. Behavioral Patterns: These patterns define how objects interact with each other.

Examples

Singleton Pattern (Creational): This pattern ensures that only one instance of a class exists.
Bridge Pattern (Structural): This pattern separates an object's implementation from its interface.
Observer Pattern (Behavioral): This pattern allows objects to subscribe to events and be notified when they occur.

When to Use Design Patterns

Solve a specific problem: Use a design pattern when it directly addresses a problem you're facing.
Anticipate change: Use a design pattern for parts of your system that are likely to change frequently.

Conclusion
Design patterns are a valuable tool for any developer. They provide solutions to common problems, improve code maintainability, and promote better communication among developers.