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 examples

In this section, we are going to look at two examples of how the useState hook is applied in practice.

Making an avatar component

Let's say you want to display an image of a person that you have pulled from the internet. Most of the time, it will turn out to be a good picture (see Figure 4.7). But sometimes, an image can be unavailable to download due to network or permission issues. When this happens, the browser throws a broken icon (the logo in the middle of Figure 4.7), which is not as nice to look at. The latest UX research shows that if we replace any broken image icons with something more unique (such as a user's name or initials, as shown on the right of Figure 4.7), this improves the user experience.

Figure 4.7 – An avatar component using useState

In order to switch between an image and text, we can apply useState to define a condition. We will also need an event handler to notify us when an image URL is broken...