Design Patterns Mastery

Introduction to GoF Patterns: Why patterns matter? SOLID Principles: The foundation of all patterns DRY, KISS, and YAGNI (Architectural Philosophy) Singleton Pattern: Thread-safety & Captive Dependencies Factory Method: Abstracting complex object creation Abstract Factory: Creating families of related objects Builder Pattern: Constructing complex fluents Prototype Pattern: Cloning high-cost objects Adapter Pattern: Bridging incompatible interfaces Bridge Pattern: Decoupling abstraction from implementation Composite Pattern: Managing tree structures & hierarchies Decorator Pattern: Enhancing behavior without inheritance Facade Pattern: Simplifying complex library subsystems Flyweight Pattern: Drastically reducing memory footprint Proxy Pattern: Interception, Lazy-Loading, and Security Chain of Responsibility: Middleware & Pipeline Architecture Command Pattern: Implementing Undo/Redo & Queueing Interpreter Pattern: Building domain-specific languages Iterator Pattern: Unified traversal of collections Mediator Pattern: Decoupling components with MediatR Memento Pattern: Capturing and restoring object state Observer Pattern: Pub/Sub & Event-driven architecture State Pattern: Managing complex object lifecycles Strategy Pattern: Swappable algorithms at runtime Template Method: Defining skeleton algorithms Visitor Pattern: Separating operations from data structures Repository & Unit of Work (The EF Core Standard) CQRS Pattern (Command Query Responsibility Segregation) Circuit Breaker & Retry Patterns (Resilience with Polly) Dependency Injection Pattern (The Modern King)

public abstract class RemoteControl 
{
    protected IDevice _device; // THE BRIDGE
    public abstract void TogglePower();
}

public interface IDevice 
{
    void On();
    void Off();
}