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)

useContext examples

Context is used for sharing site-wise information, but it can be also very effective in sharing things in a narrower area. In this section, we'll see examples of both cases.

Theme context

One nice and common usage involving a context is theming, which allows the user to switch between a light and dark theme based on their preference. See Figure 7.7:

Figure 7.7 – A theme made with light and dark options

To implement this feature, let's start with ThemeContext:

const ThemeContext = React.createContext({
  mode: 'light',  // or 'dark'

We can set the default theme with an object supporting a mode property, which is a string to hold either "light" or "dark".

Design theme context

Any component that requires the theme can read the settings from ThemeContext. Let's build a theme-aware Button component:

const Button = () => {