Design Patterns in Programming

Design patterns are reusable solutions to common problems in software design. They help in making the code more maintainable, scalable, and flexible. Here are some popular design patterns in programming:

Creational Patterns

These patterns focus on object creation mechanisms, encapsulating the object creation logic to simplify the process.

Singleton: Ensures a class has only one instance and provides a global point of access to it.
Factory Method: Defines an interface for creating an object, but lets subclasses alter the type of objects that will be created.
Abstract Factory: Creates families of related or dependent objects without specifying their concrete classes.

Structural Patterns

These patterns deal with the composition of classes and objects to form larger structures.

Adapter: Allows objects with incompatible interfaces to collaborate.
Bridge: Separates an abstraction from its implementation so that the two can vary independently.
Composite: Composes objects into tree structures to represent part-whole hierarchies.

Behavioral Patterns

These patterns focus on communication between objects.

Observer: Defines a one-to-many dependency between objects so that when one object changes state, all its dependents are notified and updated automatically.
Strategy: Defines a family of algorithms, encapsulates each one, and makes them interchangeable.
Command: Encapsulates a request as an object, thereby letting users parameterize clients with different requests, queue or log requests, and support undoable operations.

Resources

For more information on design patterns, you can visit our Design Patterns Guide.