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)

Query parameters

A query parameter is part of the URL that allows additional parameters to be passed into a path. For example, "/products?search=redux" has a query parameter called search with a redux value.

Let's implement this example and allow the users of the shop to search for a product:

  1. Let's start by adding a variable in the state in ProductsPage.tsx called search, which is going to hold the search criteria:
interface IState {
products: IProduct[];
search: string;
  1. Given that we need to access the URL, we need to use RouteComponentProps as the props type in ProductsPage. Let's first import this:
import { RouteComponentProps } from "react-router-dom";
  1. We can then use this as the props type:
class ProductsPage extends React.Component<RouteComponentProps, IState> {
  1. We can initialize the search state to an empty string in constructor...