Design Patterns

A book, "Design Patterns: elements of reusable object-oriented software " by Gamma, Helm, Johnson and Vlissides , also known as the Gang of Four, or GoF. The first widely used source of software design patterns.

GoF describes patterns in a number of categories:

Creational Patterns

• Abstract Factory
• Builder
• Factory Method
• Prototype
• Singleton

Structural Patterns

• Adapter
• Bridge
• Composite
• Decorator
• Facade
• Flyweight
• Proxy

Behavioral Patterns

• Chain of Responsibility
• Command
• Interpreter
• Iterator
• Mediator
• Mememento
• Observer
• State
• Strategy
• Template Method
• Visitor