Book Image

React and React Native - Third Edition

By : Adam Boduch, Roy Derks
Book Image

React and React Native - Third Edition

By: Adam Boduch, Roy Derks

Overview of this book

React and React Native, Facebook’s innovative User Interface (UI) libraries, are designed to help you build robust cross-platform web and mobile applications. This updated third edition is improved and updated to cover the latest version of React. The book particularly focuses on the latest developments in the React ecosystem, such as modern Hook implementations, code splitting using lazy components and Suspense, user interface framework components using Material-UI, and Apollo. In terms of React Native, the book has been updated to version 0.62 and demonstrates how to apply native UI components for your existing mobile apps using NativeBase. You will begin by learning about the essential building blocks of React components. Next, you’ll progress to working with higher-level functionalities in application development, before putting this knowledge to use by developing user interface components for the web and for native platforms. In the concluding chapters, you’ll learn how to bring your application together with a robust data architecture. By the end of this book, you’ll be able to build React applications for the web and React Native applications for multiple mobile platforms.
Table of Contents (33 chapters)
Section 1: React
Section 2: React Native
Section 3: React Architecture

What is component state?

React components declare the structure of UI elements using JSX. However, components need data if they are to be useful. For example, your component JSX might declare <ul> that maps a JavaScript collection to <li> elements. Where does this collection come from?

State is the dynamic part of a React component. You can declare the initial state of a component, which changes over time.

Imagine that you're rendering a component where a piece of its state is initialized to an empty array. Later on, this array is populated with data using setState(). This is called a change in state, and whenever you tell a React component to change its state, the component will automatically re-render itself, calling render(). The process is visualized here:

The state of a component is something that either the component itself can set, or other pieces of code, outside of the component. Now we'll look at component properties and explain how they differ from component...