Software design pattern... object-oriented patterns are not necessarily suitable for non-object-oriented languages... a pattern must be programmed anew into each application that uses it

Creational[edit]

Singleton[edit]

Multiton[edit]

singleton allows only one instance of a class to be created, the multiton pattern allows for the controlled creation of multiple instances, which it manages through the use of a map.

Factory method[edit]

let subclasses decide which class to instantiate.

for Performance[edit]

• Lazy initialization... appears in the GoF catalog as "virtual proxy", an implementation strategy for the #Proxy pattern
  • lazy factory combines three ideas: Using a #Factory method ... Storing the instances in a map, and returning the same instance to each request for an instance with same parameters (#Multiton) ... Using lazy initialization
• Object pool pattern... uses a set of initialized objects kept ready to use – a "pool" – rather than allocating and destroying them on demand

Structural[edit]

• Adapter... Lets classes work together that couldn't otherwise because of incompatible interfaces

  its subclass uses foreign interface, but in #Proxy such implementation detail is unknown

• Decorator allows behavior to be added to an individual object, dynamically, without affecting the behavior of other objects from the same class... Decorator use can be more efficient than subclassing - it is Cacheing

• bridge pattern is useful when both the class and what it does vary often... An abstraction and its implementation should be defined and extended independently from each other... implementation can be selected at run-time.

Proxy[edit]

sender and receiver have same interface

Behavioural[edit]

• Command

  is the basis for Editing patterns, State management

  • Memento provides the ability to restore an object to its previous state (undo)... originator is some object that has an internal state.. caretaker first asks the originator for a memento object. Then it does whatever operation.. To roll back to the state before the operations, it returns the memento object to the originator.
• Observer (or Publish/subscribe)
• State, Strategy, Interpreter has Context; Template is a young Strategy

Asynchronous patterns[edit]