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

Event-Driven Programming Patterns

Event-driven programming in JavaScript is very widespread and is the only way to handle certain scenarios. Maintaining performance and security around event listeners is of paramount importance. Mismanaged event listeners have been a historical source of bugs and critical performance issues; we’ll address this via the event delegation pattern. Secure messaging between frames and contexts has always been crucial in the context of payments. More recently, new primitives are being added to the web platform and JavaScript that exposes an event/messaging interface for maintaining isolation between contexts.

In this chapter, we’ll cover the following topics:

  • Implementing event delegation
  • Using the postMessage interface to communicate across contexts with an example of a payment iframe
  • Common event listener antipatterns and how to remediate them

At the end of this chapter, you’ll have learned how to use advanced...