Behavioral pattern

In software engineering, behavioral design patterns are design patterns that identify common communication patterns between objects and realize these patterns. By doing so, these patterns increase flexibility in carrying out this communication.

Examples of this type of design pattern include:

Chain of responsibility pattern: Command objects are handled or passed on to other objects by logic-containing processing objects
Command pattern: Command objects encapsulate an action and its parameters
Interpreter pattern: Implement a specialized computer language to rapidly solve a specific set of problems
Iterator pattern: Iterators are used to access the elements of an aggregate object sequentially without exposing its underlying representation
Mediator pattern: Provides a unified interface to a set of interfaces in a subsystem
Memento pattern: Provides the ability to restore an object to its previous state (rollback)
Null Object pattern: designed to act as a default value of an object
Observer pattern: aka Publish/Subscribe or Event Listener. Objects register to observe an event which may be raised by another object
State pattern: A clean way for an object to partially change its type at runtime
Strategy pattern: Algorithms can be selected on the fly
Specification pattern: Recombinable Business logic in a boolean fashion
Template method pattern: Describes the program skeleton of a program
Visitor pattern: A way to separate an algorithm from an object
Single-serving visitor pattern: Optimise the implementation of a visitor that is allocated, used only once, and then deleted
Hierarchical visitor pattern: Provide a way to visit every node in a hierarchical data structure such as a tree.

See also