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)
1
Part 1:Design Patterns
5
Part 2:Architecture and UI Patterns
9
Part 3:Performance and Security Patterns

Loading and running scripts in a worker thread

One of the Next.js Script strategy options is worker, which loads and runs the script in a web worker. In current Next.js versions, this is achieved via a library called Partytown (https://partytown.builder.io/). The following is from the Partytown documentation:

“Partytown is a lazy-loaded library to help relocate resource-intensive scripts into a web worker, and off of the main thread. Its goal is to help speed up sites by dedicating the main thread to your code, and offloading third-party scripts to a web worker.” Partytown home page – https://partytown.builder.io/

To expand on that definition, JavaScript runs in a single-threaded environment in the browser. “Single-threaded” means we only have one entity able to execute compute operations; non-asynchronous work cannot be done in parallel. The main thread in this context is the browser’s JavaScript execution thread. When loading and executing...