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

Testing Hooks

Now our blog application makes full use of Hooks! We even defined custom Hooks for various functions to make our code more reusable, concise, and easy to read.

When defining custom Hooks, it makes sense to write tests for them to ensure they work properly, even when we change them later on or add more options.

To test our Hooks, we are going to use the Jest test runner, which is included in our create-react-app project. However, as a result of the rules of Hooks, we cannot call Hooks from the test functions because they can only be called inside the body of a function component.

Because we do not want to create a component specifically for each test, we are going to use the React Hooks Testing Library to test Hooks directly. This library actually creates a test component and provides various utility functions to interact with the Hook.