GoF Core Design Patterns :- Behavioral Design Patterns

This post can be used as a quick refresher of the GoF Behavioral Design Patterns. I have just given the intents of each of the Behavioral patterns. This will be of use to experienced professionals.

Chain of Responsibility
INTENT: Avoid coupling the sender of a request to its receiver by giving more than one object a chance to handle the request. Chain the receiving objects and pass the request along the chain until an object handles it.

Command
INTENT: Encapsulate a request as an object, thereby letting you parameterize clients with different requests, queue or log requests, and support undo operations.

Interpreter
INTENT: Given a language, define a representation for its grammar, along with an interpreter that uses the representation to interpret sentences in the language.

Iterator
INTENT: Provide a way to access the elements of an aggregate object sequentially with out exposing its underlying implementation.

Mediator
INTENT: Define an object that encapsulates how a set of objects interact. Mediator promotes loose coupling by keeping objects from referring to each other explicitly, and lets you vary their interaction independently.

Memento
INTENT: Without violating encapsulation, capture and internalize an object’s internal state so that objects can be restored to this state later.

Observer
INTENT: Define a one-to-many dependency so that when one object changes state, all its dependents are notified and updated automatically.

State
INTENT: Allow an object to alter its behavior when its internal state changes. The object will appear to change its class.

Strategy
INTENT: Define a family of algorithms, encapsulate each one, and make them interchangeable. Strategy lets the algorithm vary independently from the clients that use it.

Template Method
INTENT: Define the skeleton of an algorithm in an operation, deferring some steps to its subclasses. Template method lets subclasses redefine certain steps of an algorithm without changing the algorithm’s structure.

Visitor
INTENT: Represent an operation to be performed on elements of an object structure. Visitor lets you define a new operation without changing the classes of the elements on which it operates.

RK

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