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

Why components need a life cycle

React components go through a life cycle. In fact, the render() method that you've implemented in your components so far in this book is actually a life cycle method. Rendering is just one life cycle event in a React component.

For example, there are life cycle events for when the component is mounted to the DOM, when the component is updated, and so on. Life cycle events are yet another moving part, so you'll want to keep them to a minimum. As you'll learn in this chapter, some components do need to respond to life cycle events to perform initialization, render heuristics, clean up after the component when it's unmounted from the DOM, or to handle errors thrown by the component.

The following diagram gives you an idea of how a component flows through its life cycle, calling the corresponding methods in turn:

These are the two main life cycle flows of a React component. The first happens when the component is initially rendered. The...