Design patterns are reusable solutions to common problems in software design. They provide a template for solving issues that arise repeatedly during development. Here’s a guide to key design patterns:
Common Categories 📚
Creational Patterns 🧱
- Singleton: Ensures a class has only one instance.
- Factory Method: Defines an interface for creating objects.
- Abstract Factory: Provides an interface for creating families of related objects.
- Builder: Separates object construction from its representation.
Structural Patterns 🧩
- Adapter: Allows incompatible interfaces to work together.
- Decorator: Adds responsibilities to objects dynamically.
- Composite: Composes objects into tree structures.
- Facade: Simplifies complex subsystems.
Behavioral Patterns 🎭
- Observer: Defines a one-to-many dependency between objects.
- Strategy: Encapsulates an algorithm in a class.
- Command: Encapsulates a request as an object.
- State: Allows an object to change its behavior based on internal state.
Practical Examples 📌
- Use Singleton for managing global resources like a database connection.
- Apply Factory Method when creating objects that depend on configuration.
- Implement Observer for event-driven systems like UI updates.
For deeper insights, explore our Design Patterns: Observer Pattern tutorial.