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)

State without an update

The ref created via useRef can be used to hold not only a DOM instance but also any value. At any time, we can change its current property with a new assignment:

  ref.current = ...

The assignment can be a JavaScript expression. What's special about this is that the ref assignment doesn't do anything more than an assignment. This implies that it does not trigger an update. Let's take a look at how it impacts the UI when we wire it to a user action:

const Title = () => {
  const ref = useRef(null)
  const onClick = () => {
    ref.current = 'white'
  return <Child color={ref} onClick={onClick} />

In the preceding code, an event handler is wired with the Child component, and when the user clicks, it assigns a color into ref.current. It looks pretty similar to the case using a useState hook. If we were using a useState hook, the code would...