Software Design Patterns in 2023: A Comprehensive Guide

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If you are someone who works in software development, you might have come across the term design patterns. Software design patterns refer to a set of best practices used to solve common software design problems. These patterns are tested and proven solutions to common problems that developers often run into.

In this article, we will discuss software design patterns in 2023 and how they can improve software development. We will cover different types of design patterns, history of software design patterns, and even provide a quick FAQ section and some tips and advice.

History of Software Design Patterns

Design patterns have been around for decades and have come a long way. The concept of design patterns originated with Christopher Alexander's book "A Pattern Language" in 1977. This book described patterns for architecture and town planning.

Design patterns for software development, on the other hand, were first introduced in 1994 by the "Gang of Four" (Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides) in their book "Design Patterns: Elements of Reusable Object-Oriented Software".

Since then, design patterns have become an integral part of software development. They are widely used to solve common problems and improve efficiency.

Structure of Software Design Patterns

Software design patterns can be structured into three different categories:

  1. Creational patterns
  2. Structural patterns
  3. Behavioral patterns

1. Creational Patterns

Creational patterns deal with object creation mechanisms trying to create objects in a manner that is suitable to the situation. Creational patterns include:

  • Factory Method
  • Abstract Factory
  • Builder
  • Singleton
  • Prototype

2. Structural Patterns

Structural patterns deal with object composition. They describe how objects are composed to form larger structures. Structural patterns include:

  • Adapter
  • Bridge
  • Composite
  • Decorator
  • Facade
  • Flyweight
  • Proxy

3. Behavioral Patterns

Behavioral patterns are concerned with communication between objects. They encapsulate the patterns of communication or responsibility. Behavioral patterns include:

  • Chain of Responsibility
  • Command
  • Interpreter
  • Iterator
  • Mediator
  • Memento
  • Observer
  • State
  • Strategy
  • Template Method
  • Visitor

Types of Design Patterns

software design patterns,Types of Design Patterns

Apart from the Creational, Structural and Behavioral patterns described above, there are other types of design patterns:

  1. Model-View-Controller (MVC) Pattern
  2. Model-View-Presenter (MVP) Pattern
  3. Model-View-ViewModel (MVVM) Pattern
  4. Repository Pattern
  5. Singleton Pattern
  6. Builder Pattern
  7. Abstract Factory Pattern
  8. Adapter Pattern
  9. Decorator Pattern
  10. Facade Pattern

All these different types of patterns are useful in solving various software design problems.

Classification and List of Design Patterns

Software design patterns can also be classified by their scope or purpose. Here is a list of different types of design patterns grouped by their purpose:

Creational Patterns

Singleton

Creates only one instance of a class and provides global access to it.

Factory Method

Defines a method that should be used for creating objects instead of directly instantiating them.

Abstract Factory

Provides an interface for creating families of related or dependent objects without specifying their concrete classes.

Builder

Separates the construction of an object from its representation, allowing for different representations of the same object.

Prototype

Creates new objects by copying an existing object.

Structural Patterns

Adapter

Converts the interface of a class into another interface clients expect.

Bridge

Decouples an abstraction from its implementation so that the two can vary independently.

Composite

Groups multiple objects into a tree-like structure, allowing clients to treat individual objects and groups of objects uniformly.

Decorator

Adds behavior to an individual object, without affecting other objects of the same class.

Facade

Provides a unified interface to a set of interfaces in a subsystem.

Flyweight

Minimizes memory usage by sharing data with similar objects.

Proxy

Provides a placeholder for another object to control access, synchronization, or adding/removing functionality.

Behavioral Patterns

Chain of Responsibility

Gives more than one object a chance to handle a request.

Command

Encapsulates a request as an object, allowing for parameterization and queuing of requests.

Interpreter

Provides a way to evaluate language grammar or expressions.

Iterator

Provides a way to access the elements of an object sequentially without exposing its underlying representation.

Mediator

Defines simplified communication between classes by using a mediator object.

Memento

Provides the ability to restore an object to its previous state.

Observer

Provides a mechanism to notify one or more objects when the state of another object changes.

State

Allows an object to alter its behavior when its internal state changes.

Strategy

Defines a family of interchangeable algorithms.

Template Method

Defines the skeleton of an algorithm in a method, deferring some steps to subclasses.

Visitor

Defines a new operation to be performed on elements of an object structure.

Documentation

Documentation is an important part of software development. Without proper documentation, it can be difficult for other developers to understand the purpose and functionality of code.

Documenting design patterns is a crucial part of using them in software development. Documenting helps other developers to understand the purpose and functionality of the pattern in a project.

Criticism

Critics of design patterns argue that they can lead to over-engineering and that it can be difficult to choose the right pattern for a given problem. They also argue that overuse of patterns can result in code that is hard to read and understand.

While it is true that design patterns can be overused and can lead to over-engineering, they still provide an excellent solution to common software design problems. It is important to apply the right pattern to the right problem and keep code readability in mind.

FAQ

What are the 4 main types of pattern used in design?

The four main types of the pattern used in design include creational, behavioral, structural, and concurrency patterns.

What are the 3 types of patterns?

The 3 types of patterns are behavioral, creational, and structural patterns.

What are the different types of design patterns?

Different types of design patterns include creational, behavioral, structural, and concurrency patterns. There are other types of design patterns too, like Model View Controller (MVC) pattern, Model View Presenter (MVP) pattern, and Model View ViewModel (MVVM) pattern.

When is it appropriate to use design patterns in software development?

Design patterns are appropriate to use in software development when you are trying to solve a common problem in a standardized way. Design patterns provide a set of best practices that can be applied to software development.

Quick Tips and Facts

  • Design patterns are tested and proven solutions to common problems in software development.
  • Documenting design patterns is an essential part of using them in software development.
  • Overuse of design patterns can result in code that is hard to read and understand.
  • Always apply the right pattern to the right problem.

Conclusion

In conclusion, software design patterns are an essential tool for software development. They provide a set of best practices that can be applied to solve common problems. Learning and applying different design patterns can improve the efficiency and readability of your code.

It's important to apply the right pattern to the right problem and keep code readability in mind. Documenting design patterns is crucial for other developers to understand the purpose and functionality of the pattern in a project.

Always apply the right pattern to the right problem. Stick to these best practices, and you'll be well on your way to improving your software development skills in 2023 and beyond.

References

Jacob
Jacob

Jacob is a software engineer with over 2 decades of experience in the field. His experience ranges from working in fortune 500 retailers, to software startups as diverse as the the medical or gaming industries. He has full stack experience and has even developed a number of successful mobile apps and games.

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