JavaScript design patterns

Here you will find most usefull (in my opinion) design patterns implemented in JavaScript. Enjoy! :)

Creational

Constructor functions that can be used to instantiate new objects
Factory factory simply generates an instance for client without exposing any instantiation logic to the client
Prototype In this, we use a sort of a “skeleton” of an existing object to create or instantiate new objects.
Singelton pattern where only one instance of a class can exist.
Abstract Factory factory that groups the individual but related/dependent factories together without specifying their concrete classes
Builder separate the construction from its representation. Useful when there are a lot of steps involved in creation of an object.

Adapter lets you wrap an otherwise incompatible object in an adapter to make it compatible with another class.
Bridge decouple an abstraction of object from its implementation so that the two can vary independently
Composite composes objects into tree-like structures to represent whole-part hierarchies
Decorator lets you dynamically change the behavior of an object at run time by wrapping them in an object of a decorator class.
Facade provides a simplified interface to a complex subsystem. (jquery)
Flyweight minimize memory usage or computational expenses by sharing as much as possible with similar objects. (memoization, cache)
Proxy provides a placeholder for another object to control access, reduce cost, and reduce complexity.

Chain Of Resp Request enters from one end and keeps going from object to object till it finds the suitable handler. (even propagation)
Command provide the means to decouple client from receiver. (Reciver, Command, Invoker)
Iterator way to sequentialy access the elements of an object without exposing the underlying presentation.
Observer defines a dependency between objects so that whenever an object changes its state, all its dependents are notified. (Pub/Sub, Observables)
Visitor let's you add further operations to objects without having to modify them.
Mediator control the interaction between two objects (chatroom, users)
Memento capturing and storing the current state of an object in a manner that it can be restored later on in a smooth manner. (edit ,save, restore)
State lets you change the behavior of a class when the state changes. (waiting for payment ,procesing, shipping)