Book Image

Learn React Hooks

By : Daniel Bugl
Book Image

Learn React Hooks

By: Daniel Bugl

Overview of this book

React Hooks revolutionize how you manage state and effects in your web applications. They enable you to build simple and concise React.js applications, along with helping you avoid using wrapper components in your applications, making it easy to refactor code. This React book starts by introducing you to React Hooks. You will then get to grips with building a complex UI in React while keeping the code simple and extensible. Next, you will quickly move on to building your first applications with React Hooks. In the next few chapters, the book delves into various Hooks, including the State and Effect Hooks. After covering State Hooks and understanding how to use them, you will focus on the capabilities of Effect Hooks for adding advanced functionality to React apps. You will later explore the Suspense and Context APIs and how they can be used with Hooks. Toward the concluding chapters, you will learn how to integrate Redux and MobX with React Hooks. Finally, the book will help you develop the skill of migrating your existing React class components, and Redux and MobX web applications to Hooks. By the end of this book, you will be well-versed in building your own custom Hooks and effectively refactoring your React applications.
Table of Contents (19 chapters)
Free Chapter
Section 1: Introduction to Hooks
Section 2: Understanding Hooks in Depth
Section 3: Integration and Migration

Comparing our reimplementation with real Hooks

Our simple Hook implementation already gives us an idea about how Hooks work internally. However, in reality, Hooks do not use global variables. Instead, they store state within the React component. They also deal with the Hook counter internally, so we do not need to manually reset the count in our function component. Furthermore, real Hooks automatically trigger rerenders of our component when the state changes. To be able to do this, however, Hooks need to be called from a React function component. React Hooks cannot be called outside of React, or inside React class components.

By reimplementing the useState Hook, we have learned a couple things:

  • Hooks are simply functions that access React features
  • Hooks deal with side effects that persist across rerenders
  • The order of Hook definitions matters

The last point is especially important...