Design Patterns

Patterns	Type	Description
Creational Patterns	Factory	This pattern is used to create concrete class instances without specifying the exact class type.
	Abstract Factory	This pattern is used to create concrete class instances without specifying the exact class type. The Abstract Factory Pattern provides a way to encapsulate a group of individual factories that have a common theme.
	Flyweight	A pattern used to maximize the sharing of objects resulting in reduced memory consumption.
	Singleton	This pattern insures that only a single instance of a given object can exist.
	Builder	This pattern separate the construction of a complex object from its representation so that the same construction process can create different representations..
Structural Patterns	Adapter	Convert the interface of a class into another interface clients expect. Adapter lets the classes work together that couldn’t otherwise because of incompatible interfaces
	Bridge	Decouples an abstraction from its implementation so that the two can vary independantly.
	Composite	Compose objects into tree structures to represent part-whole hierarchies. Composite lets clients treat individual objects and compositions of objects uniformly.
	Decorator	Allows an objects behavior to be altered at runtime.
	Facade	Used to provide a simpler interface into a more complicated portion of code.
	Proxy	Provides a Placeholder for another object to control access to it.
Behavioral Patterns	Chain of Responsibility	The chain of responsibility pattern is a way of communicating between objects.
	Command	Encapsulates a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undoable operations.
	Iterator	Provides a way to sequentially access aggregate objects without exposing the structure of the aggregate.
	Mediator	The mediator pattern encapsulate the interaction between a set of objects.
	Memento	Allows you to save the state of an object externally from that object.
	Observer	Allows a single object to notify many dependent objects that its state has changed.
	State	Allows an object to change its behavior when its internal state changes.
	Strategy	Allows multiple algorithms to be used interchangeably at runtime.
	Visitor	The visitor design pattern enables us to create new operations to be performed on an existing structure.
	Template Method	Defines the skeleton of an algorithm then lets subclasses implement the behavior that can vary.