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Learn React with TypeScript

Learn React with TypeScript - Second Edition

By : Carl Rippon
4.5 (20)
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Learn React with TypeScript

Learn React with TypeScript

4.5 (20)
By: Carl Rippon

Overview of this book

Reading, navigating, and debugging a large frontend codebase is a major issue faced by frontend developers. This book is designed to help web developers like you learn about ReactJS and TypeScript, both of which power large-scale apps for many organizations. This second edition of Learn React with TypeScript is updated, enhanced, and improved to cover new features of React 18 including hooks, state management libraries, and features of TypeScript 4. The book will enable you to create well-structured and reusable React components that are easy to read and maintain, leveraging modern design patterns. You’ll be able to ensure that all your components are type-safe, making the most of TypeScript features, including some advanced types. You’ll also learn how to manage complex states using Redux and how to interact with a GraphQL web API. Finally, you’ll discover how to write robust unit tests for React components using Jest. By the end of the book, you’ll be well-equipped to use both React and TypeScript.
Table of Contents (19 chapters)
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1
Part 1: Introduction
6
Part 2: App Fundamentals
10
Part 3: Data
14
Part 4: Advanced React

Creating TypeScript types

The last section showed that TypeScript has a great set of standard types. In this section, we will learn how to create our own types. We will start by learning three different methods for creating object types. We will then learn about strongly-typing JavaScript classes. Lastly, we will learn two different methods for creating types for variables that hold a range of values.

Using object types

Objects are very common in JavaScript programs, so learning how to represent them in TypeScript is really important. In fact, we have already used an object type earlier in this chapter for the product parameter in the calculateTotalPrice function. Here is a reminder of the product parameter’s type annotation:

function calculateTotalPrice(
  product: { name: string; unitPrice: number },
  ...
) {
  ...
}

An object type in TypeScript is represented a bit like a JavaScript object literal. However, instead of property values...

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Learn React with TypeScript
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