Book Image

Designing React Hooks the Right Way

By : Fang Jin
Book Image

Designing React Hooks the Right Way

By: Fang Jin

Overview of this book

React hook creates a unique solution for using states in function components to orchestrate UI communication. They provide you with an easy interface to write custom data management solutions with low development and maintenance costs. Understanding how Hooks are designed enables you to use them more effectively, and this book helps you to do just that. This book starts with a custom-crafted solution to reveal why Hooks are needed in the first place. You will learn about the React engine and discover how each built-in Hook can manage a persistent value by hooking into it. You will walk through the design and implementation of each hook with code so that you gain a solid understanding. Finally, you'll get to grips with each Hook's pitfalls and find out how to effectively overcome them. By the end of this React book, you'll have gained the confidence to build and write Hooks for developing functional and efficient web applications at scale.
Table of Contents (12 chapters)

Performance degradation

When we build a site, we normally start it with a draft or prototype version where a couple of pages are laid out with the sample data and the preliminary logic. The idea is to start small and see whether the site has any potential to grow. Though this is a very common approach, interestingly, most of the performance-related issues do not show up at this point. When the site with the real business logic grows, we start to experience performance degradation issues. Understanding how these issues are created in the first place is valuable since it helps us plan for the growth of the site.

Let's build such a case from scratch. A variable defined inside the body of a function component is evaluated when it gets invoked:

const Title = ({ text }) => {
  const a = 1

In the preceding code, the a variable is assigned with a 1 constant. Storing a number like this shouldn't cost us much when a is reassigned every time when...