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


In this chapter, we’ve covered techniques to control asset and JavaScript loading more granularly.

In order to control script loading using browser built-in functionality, we can use async and defer attributes; we covered their effect on module scripts versus classic scripts. We also looked at using the rel attribute on a link element for resource hints, and what impact preconnect, preload, modulepreload, and prefetch have on resource loading.

We can leverage the Next.js Script component’s strategy prop to control script loading and execution beyond async and defer in the context of a Next.js application.

Finally, we looked at the possibility of running certain scripts off the main JavaScript thread using the Next.js Script worker strategy, powered by the Partytown library.

In this final chapter, we covered asset loading strategies and optimizations such as executing code off the main thread.

This brings us to the end of this book. Hopefully, you...