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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

Using generic props

In this section, we’ll take some time to understand how to create our own generic types and also learn about the keyof TypeScript feature, which is useful for generic types. We will use this knowledge to build the first iteration of the checklist component with a generic type for its props.

Understanding generics

We have used generics throughout this book. For example, the useState hook has an optional generic parameter for the type of state variable:

const [visible, setVisible] = useState<boolean>()

Generic parameters in a function allow that function to be reusable with different types and be strongly typed. The following function returns the first element in an array, or null if the array is empty. However, the function only works with a string array:

function first(array: Array<string>): string | null {
  return array.length === 0 ? null : array[0];
}

Generics allows us to make this function usable with any type...

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Learn React with TypeScript
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