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)

useEffect examples

The useEffect hook is normally used for any side effect – whether that is to read from an external object or write to an external object. In the following sections, we are going to see two more examples: Finding the window size and Fetching an API resource.

Finding the window size

Let's say that we want to know the current browser window size at runtime so that a greeting title can fit perfectly onto the screen (see Figure 5.6):

Figure 5.6 – Finding the window size

This can be done normally with a CSS media query, but this time, we want to do it via JavaScript, as a runtime JavaScript variable obtained can be sent for purposes other than CSS usage:

const Greeting = () => {
  const [width, setWidth] = useState(0)
  useEffect(() => {
    function handleResize() {
    } ...