Book Image

JavaScript Design Patterns

By : Hugo Di Francesco
Book Image

JavaScript Design Patterns

By: Hugo Di Francesco

Overview of this book

Unlock the potential of JavaScript design patterns, the foundation for development teams seeking structured and reusable solutions to common software development challenges in this guide to improving code maintainability, scalability, and performance. Discover how these patterns equip businesses with cleaner and more maintainable code, promote team collaboration, reduce errors, and save time and costs. This book provides a comprehensive view of design patterns in modern (ES6+) JavaScript with real-world examples of their deployment in professional settings. You’ll start by learning how to use creational, structural, and behavioral design patterns in idiomatic JavaScript, and then shift focus to the architecture and UI patterns. Here, you’ll learn how to apply patterns for libraries such as React and extend them further to general web frontend and micro frontend approaches. The last section of the book introduces and illustrates sets of performance and security patterns, including messaging and events, asset and JavaScript loading strategies, and asynchronous programming performance patterns. Throughout the book, examples featuring React and Next.js, in addition to JavaScript and Web API examples, will help you choose and implement proven design patterns across diverse web ecosystems, transforming the way you approach development.
Table of Contents (16 chapters)
Part 1:Design Patterns
Part 2:Architecture and UI Patterns
Part 3:Performance and Security Patterns

Working with Creational Design Patterns

JavaScript design patterns are techniques that allow us to write more robust, scalable, and extensible applications in JavaScript. JavaScript is a very popular programming language, in part due to its place as a way to deliver interactive functionality on web pages. The other reason for its popularity is JavaScript’s lightweight, dynamic, multi-paradigm nature, which means that design patterns from other ecosystems can be adapted to take advantage of JavaScript’s strengths. JavaScript’s specific strengths and weaknesses can also inform new patterns specific to the language and the contexts in which it’s used.

Creational design patterns give structure to object creation, which enables the development of systems and applications where different modules, classes, and objects don’t need to know how to create instances of each other. The design patterns most relevant to JavaScript – the prototype, singleton, and factory patterns – will be explored, as well as situations where they’re helpful and how to implement them in an idiomatic fashion.

We’ll cover the following topics in this chapter:

  • A comprehensive definition of creational design patterns and definitions for the prototype, singleton, and factory patterns
  • Multiple implementations of the prototype pattern and its use cases
  • An implementation of the singleton design pattern, eager and lazy initialization, use cases for singleton, and what a singleton pattern in modern JavaScript looks like
  • How to implement the factory pattern using classes, a modern JavaScript alternative, and use cases

By the end of this chapter, you’ll be able to identify when a creational design pattern is useful and make an informed decision on which of its multiple implementations to use, ranging from a more idiomatic JavaScript form to a classical form.