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Behavioral

Behavioral patterns

Behavioral patterns are concerned with the assignment of responsibilities between objects, or, encapsulating behavior in an object and delegating requests to it.

In these design patterns, the interaction between the objects should be in such a way that they can easily talk to each other and still should be loosely coupled.

That means the implementation and the client should be loosely coupled in order to avoid hard coding and dependencies.

Summary

Design Pattern Summary
Callback A way to pass a set of statements to execute as an argument
Chain of Responsibility A way of passing a request between a chain of objects
Command Encapsulate a command request as an object
Delegation Delegates responsibility for implementing that behaviour to an associated object
Interpreter A way to include language elements in a program
Iterator Sequentially access the elements of a collection
Mediator Defines simplified communication between classes
Memento Capture and restore an object's internal state
NullObject Designed to act as a default value of an object
Observer A way of notifying change to a number of classes
State Alter an object's behavior when its state changes
Strategy Encapsulates an algorithm inside a class
TemplateMethod Defer the exact steps of an algorithm to a subclass
Visitor Defines a new operation to a class without change