Design patterns in one lines

DesginPattern.txt

                                      Design patterns 

Behavioural: Deals with communication of objects
  Chain-Of-Responsibility - Think of UIResponder class
  Command pattern         - NSInvocation class. Support undoable operations
  Interpreter             - language parsing. Think of expression evaluation
  Iterator                - NSEnumerator; A unified interface for interating a collection.
  Mediator                - Think of a translator's role in multi lingual people communication.
  Memento                 - Think of a storing in the middle of a game and restore it.
  observer                - KVO.
  State                   - Think of a premium and basic user on file sharing site. 
                            (The data such as speed , download limit, etc changes based on a condition. )
                            
Creation : Deals with object creation
  Abstract Factory        - Returns a factory method to create objects. 
  Factory Method          - Think of NSArray init methods.
  Singleton               - One object to rule them all.
  Builder                 - Create object based on a builder passed. 
                            ( Useful to when object creation needs some order or particular algorithm )
  Prototype               - Object with clonable interface. 
  
Structural : Deals with the object relations  
  Adapter                 - Need them when legacy code has to be reused with a modern interface.
  Bridge                  - Prefer composition over unnecessary inheritance. Remember RedRectangle is silly.
  Composite               - Think of a directory. It can contain sub directories and files. 
  Decorator               - Embellish an object using composition
  Protection proxy        - Protect an object using composition
  Virtual proxy           - On demand initialization using composition.
  Facade                  - Simple interface to hide structural complexity.
  
Implemetation of all these patterns in swift can be found here: https://github.com/ochococo/Design-Patterns-In-Swift