[Architecture]: Gang of Four (GoF) Design Patterns

The Gang of Four (GoF) patterns are generally considered the foundation for all other patterns. They are categorized in three groups: Creational, Structural, and Behavioral. Here you will find information on these important patterns.

Creational Patterns

· Abstract Factory Creates an instance of several families of classes

· Builder Separates object construction from its representation

· Factory Method Creates an instance of several derived classes

· Prototype A fully initialized instance to be copied or cloned

· Singleton A class of which only a single instance can exist

Structural Patterns

· Adapter Match interfaces of different classes

· Bridge Separates an object’s interface from its implementation

· Composite A tree structure of simple and composite objects

· Decorator Add responsibilities to objects dynamically

· Facade A single class that represents an entire subsystem

· Flyweight A fine-grained instance used for efficient sharing

· Proxy An object representing another object

Behavioral Patterns

· Chain of Resp. A way of passing a request between a chain of objects

· Command Encapsulate a command request as an object

· Interpreter A way to include language elements in a program

· Iterator Sequentially access the elements of a collection

· Mediator Defines simplified communication between classes

· Memento Capture and restore an object's internal state

· Observer A way of notifying change to a number of classes

· State Alter an object's behavior when its state changes

· Strategy Encapsulates an algorithm inside a class

· Template Method Defer the exact steps of an algorithm to a subclass

· Visitor Defines a new operation to a class without change