Software Design Patterns Overview

Key Concepts

• Design patterns are reusable solutions to common software design problems
• They provide templates rather than finished code
• Help speed up development and improve code readability

Main Categories

1. Creational Patterns

   • Focus on class instantiation
   • Include Abstract Factory, Builder, Factory Method, Object Pool, Prototype, and Singleton

2. Structural Patterns

   • Deal with class and object composition
   • Include Adapter, Bridge, Composite, Decorator, Facade, Flyweight, and Proxy

3. Behavioral Patterns

   • Handle object communication
   • Include Chain of Responsibility, Command, Iterator, Observer, State, and Strategy

Criticisms

• May target wrong problems due to language limitations
• Lack formal foundations
• Can lead to inefficient solutions
• May not differ significantly from other abstractions