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

Reimplementing the useState function

In order to get a better understanding of how Hooks work internally, we are going to reimplement the useState Hook from scratch. However, we are not going to implement it as an actual React Hook, but as a simple JavaScript function—just to get an idea of what Hooks are actually doing.

Please note that this reimplementation is not exactly how React Hooks work internally. The actual implementation is similar, and thus, it has similar constraints. However, the real implementation is much more complicated than what we will be implementing here.

We are now going to start reimplementing the State Hook:

  1. First, we copy the code from chapter1_2, where we are going to replace the current useState Hook with our own implementation.
  2. Open src/App.js and remove the import of the Hook by removing the following line:
import React, { useState } from...