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)

useState design

React provides a useState hook to manage the state within function components. The following code example shows its common usage:

const Title = () => {
  const [state, dispatch] = useState(initialState)
  const onClick = () => {
  return <button onClick={onClick} />

The useState function takes an initialState argument as the input argument and returns a state object and a dispatch function. The dispatch function can be used to request a state change into a newState object.

Have you ever wondered how React designs the useState hook behind the scenes? Why does it return an array? How do we know if a new dispatch is successful or not? Most importantly, how can we be sure about the current state in each render?

To answer these questions, we will open up the engine and take a look inside. We will read through a stripped-down version of the source code to gain...