Design Patterns - Elements of reusable object oriented software

This repository is created as a summary of the book "Design Patterns - Elements of reusable object oriented software" by Eric Gamma, Richard Helm, Ralph Johnson and John Vlissides (ISBN-13: 978-0-201-63361-0 / ISBN-10: 0-201-63361-2). For more details, please read the book.

Also, check Refactoring Guru, softwarepatternslexicon.com, geeksforgeeks.org, sbcode.net for more code samples.

Table of contents

• 1 Intro
  • 1.1 What is design pattern
  • 1.2 The catalog of design patterns
  • 1.3 How design patterns solve design problems
  • 1.4 How to select a design pattern
  • 1.5 How to use a design pattern
• 2 Design Pattern Catalog and Sample Codes
  • 2.1 Creational Patterns
    • Creational Patterns
    • Discussion of Creational Patterns
    • 2.1.1 Abstract Factory
      • Abstract Factory
      • Sample Codes
    • 2.1.2 Builder
      • Builder
      • Sample Codes
    • 2.1.3 Factory Method
      • Factory Method
      • Sample Codes
    • 2.1.4 Prototype
      • Prototype
      • Sample Codes
    • 2.1.5 Singleton
      • Singleton
      • Sample Codes
  • 2.2 Structural Patterns
    • Structural Patterns
    • Discussion of Structural Patterns
    • 2.2.1 Adapter
      • Adapter
      • Sample Codes
    • 2.2.2 Bridge
      • Bridge
      • Sample Codes
    • 2.2.3 Composite
      • Composite
      • Sample Codes
    • 2.2.4 Decorator
      • Decorator
      • Sample Codes
    • 2.2.5 Facade
      • Facade
      • Sample Codes
    • 2.2.6 Flyweight
      • Flyweight
      • Sample Codes
    • 2.2.7 Proxy
      • Proxy
      • Sample Codes
  • 2.3 Behavioral Patterns
    • Behavioral Patterns
    • Discussion of Behavioral Patterns
    • 2.3.1 Chain of Responsibility
      • Chain of Responsibility
      • Sample Codes
    • 2.3.2 Command
      • Command
      • Sample Codes
    • 2.3.3 Interpreter
      • Interpreter
      • Sample Codes
    • 2.3.4 Iterator
      • Iterator
      • Sample Codes
    • 2.3.5 Mediator
      • Mediator
      • Sample Codes
    • 2.3.6 Memento
      • Memento
      • Sample Codes
    • 2.3.7 Observer
      • Observer
      • Sample Codes
    • 2.3.8 State
      • State
      • Sample Codes
    • 2.3.9 Strategy
      • Strategy
      • Sample Codes
    • 2.3.10 Template Method
      • Template Method
      • Sample Codes
    • 2.3.11 Visitor
      • Visitor
      • Sample Codes

Code Execution

• PHP: php filename.php
• C++: g++ filename.cc -o filename && ./filename
• Python: python3 filename.py
• JAVA: javac filename.java && java filename
• GO: go run filename.go
• TypeScript: npx tsx filename.ts