Preface

Welcome! JavaScript design patterns are techniques that allow us to write more robust, scalable, and extensible applications in JavaScript. JavaScript is the main programming language available in web browsers and is one of the most popular programming languages with support beyond browsers.

Design patterns are solutions to common problems that can be reused. The most-written-about design patterns come from the world of object-oriented programming.

JavaScript’s attributes as a lightweight, multi-paradigm, dynamic, single-threaded language give it different strengths and weaknesses to other mainstream programming languages. It’s common for software engineers to use JavaScript in addition to being well versed in a different programming language. JavaScript’s different gearing means that implementing design patterns verbatim can lead to non-idiomatic and under-performing JavaScript applications.

There are many resources on JavaScript and design patterns, but this book provides a cohesive and comprehensive view of design patterns in modern (ECMAScript 6+) JavaScript with real-world examples of how to deploy them in a professional setting. In addition to this complete library of patterns to apply to projects, this book also provides an overview of how to structure different parts of an application to deliver high performance at scale.

In this book, you will be provided with up-to-date guidance through the world of modern JavaScript patterns based on nine years of experience building and deploying JavaScript and React applications at scale at companies such as Elsevier, Canon, and Eurostar, delivering multiple system evolutions, performance projects, and a next-generation frontend application architecture.