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: useState, useEffect, and useRef

In Chapter 6, Use Memo to Boost Performance, we ran into a very interesting implementation where we debounced the user keystroke so that we don't invoke a heavy operation (such as search) too frequently.

Figure 9.4 – useDebounced hook

A pattern that emerged is that for a given state, whenever we change it via dispatch, we want to wait for a period of time before we are assured that it's the right time to act upon it. So essentially we want to design a new state as a debounced version of a given state. Let's try to capture this pattern in a custom useDebounced hook:

const useDebounced = (oldState, duration) => {
  const [state, dispatch] = useState(oldState)
  const invokeRef = useRef(null) 
  useEffect(() => {
    invokeRef.current = setTimeout(() => {