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)


Hooks used in this custom hook: useEffect

In Chapter 8, Use Ref to Hide Stuff, we learned about a case where we can detect when a user clicks outside a component. This feature is pretty generic and we want to take advantage of this in various parts of the project, such as dismissing a modal or tooltip – see Figure 9.5.

Figure 9.5 – useClickOutside hook

Let's see if we can refactor the old code a bit and turn it into a custom useClickOutside hook:

function useClickOutside(ref, handler) {
  useEffect(() => {
    const evt = e => {
      if (!ref.current) return 
      if (!ref.current.contains( {
        handler && handler()