Book Image

Learn React with TypeScript 3

By : Carl Rippon
Book Image

Learn React with TypeScript 3

By: Carl Rippon

Overview of this book

React today is one of the most preferred choices for frontend development. Using React with TypeScript enhances development experience and offers a powerful combination to develop high performing web apps. In this book, you’ll learn how to create well structured and reusable react components that are easy to read and maintain by leveraging modern web development techniques. We will start with learning core TypeScript programming concepts before moving on to building reusable React components. You'll learn how to ensure all your components are type-safe by leveraging TypeScript's capabilities, including the latest on Project references, Tuples in rest parameters, and much more. You'll then be introduced to core features of React such as React Router, managing state with Redux and applying logic in lifecycle methods. Further on, you'll discover the latest features of React such as hooks and suspense which will enable you to create powerful function-based components. You'll get to grips with GraphQL web API using Apollo client to make your app more interactive. Finally, you'll learn how to write robust unit tests for React components using Jest. By the end of the book, you'll be well versed with all you need to develop fully featured web apps with React and TypeScript.
Table of Contents (14 chapters)

Class component life cycle methods

Life cycle methods in a class component allow us to run code at particular points in the process. The following is a high-level diagram of the component process, showing when the different methods are invoked:

Diagram of modern React life cycle methods, from React documentation


componentDidMount is invoked when a component has been inserted into the DOM. Here are some common use cases for this method:

  • Calling a web service to get some data
  • Adding event listeners
  • Initializing timers
  • Initializing third-party libraries

We're going to change the app we have been building to give users a time limit of 10 seconds to confirm whether or not they want to learn React and...