Design Patterns Implementation Skill

Design Patterns Implementation

Overview
When to Use
Quick Start
Reference Guides
Best Practices

Overview

Apply proven design patterns to create maintainable, extensible, and testable code architectures.

When to Use

Solving common architectural problems
Making code more maintainable and testable
Implementing extensible plugin systems
Decoupling components
Following SOLID principles
Code reviews identifying architectural issues

Quick Start

Minimal working example:

class DatabaseConnection {
  private static instance: DatabaseConnection;
  private connection: any;

  private constructor() {
    this.connection = this.createConnection();
  }

  public static getInstance(): DatabaseConnection {
    if (!DatabaseConnection.instance) {
      DatabaseConnection.instance = new DatabaseConnection();
    }
    return DatabaseConnection.instance;
  }

  private createConnection() {
    return {
      /* connection logic */
    };
  }
}

// Usage
const db1 = DatabaseConnection.getInstance();
const db2 = DatabaseConnection.getInstance();
// ... (see reference guides for full implementation)

Reference Guides

Detailed implementations in the references/ directory:

| Guide | Contents | |---|---| | Singleton Pattern | Singleton Pattern | | Factory Pattern | Factory Pattern | | Observer Pattern | Observer Pattern | | Strategy Pattern | Strategy Pattern | | Decorator Pattern | Decorator Pattern | | Repository Pattern | Repository Pattern | | Dependency Injection | Dependency Injection |

Best Practices

✅ DO

Choose patterns that solve actual problems
Keep patterns simple and understandable
Document why patterns were chosen
Consider testability
Follow SOLID principles
Use dependency injection
Prefer composition over inheritance

❌ DON'T

Apply patterns without understanding them
Over-engineer simple solutions
Force patterns where they don't fit
Create unnecessary abstraction layers
Ignore team familiarity with patterns

Agent Skills: Design Patterns Implementation

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