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


Throughout this chapter, we discussed how creational design patterns allow us to build more extensible and maintainable systems in JavaScript.

The prototype design pattern shines when creating many instances of objects that contain the same values. This design pattern allows us to change the initial values of the prototype and affect all the cloned instances.

The singleton design pattern is useful to completely hide initialization details of a class that should really only be instantiated once. We saw how JavaScript’s module system generates singletons and how that can be leveraged to simplify a singleton implementation.

The factory method design pattern allows a base class to defer the implementation of some object creations to subclasses. We saw which features would make this pattern more useful in JavaScript, as well as an alternative idiomatic JavaScript approach with factory functions.

We can now leverage creational design patterns to build classes that are composable and can be evolved as necessary to cover different use cases.

Now that we know how to create objects efficiently with creational design patterns, in the next chapter, we’ll cover how to use structural design patterns to organize relationships between different objects and classes.