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

Implementing lazy loading with React Suspense

React Suspense allows us to let components wait before rendering. At the moment, React Suspense only allows us to dynamically load components with React.lazy. In the future, Suspense will support other use cases, such as data fetching.

React.lazy is another form of performance optimization. It lets us load a component dynamically in order to reduce the bundle size. Sometimes we want to avoid loading all of the components during the initial render, and only request certain components when they are needed.

For example, if our blog has a member area, we only need to load it after the user has logged in. Doing this will reduce the bundle size for guests who only visit our blog to read blog posts. To learn about React Suspense, we are going to lazily load the Logout component in our blog app.