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

Understanding event pooling

One challenge of wrapping native event instances is that it can cause performance issues. Every synthetic event wrapper that's created will also need to be garbage collected at some point, which can be expensive in terms of CPU time.

When the garbage collector is running, none of your JavaScript code is able to run. This is why it's important to be memory efficient; frequent garbage collection means less CPU time for code that responds to user interactions.

For example, if your application only handles a few events, this wouldn't matter much. But even by modest standards, applications respond to many events, even if the handlers don't actually do anything with them. This is problematic if React constantly has to allocate new synthetic event instances.

React deals with this problem by allocating a synthetic instance pool. Whenever an event is triggered, it takes an instance from the pool and populates its properties. When the event handler...