Book Image

Mastering React Native

Book Image

Mastering React Native

Overview of this book

React Native has completely revolutionized mobile development by empowering JavaScript developers to build world-class mobile apps that run natively on mobile platforms. This book will show you how to apply JavaScript and other front-end skills to build cross-platform React Native applications for iOS and Android using a single codebase. This book will provide you with all the React Native building blocks necessary to become an expert. We’ll give you a brief explanation of the numerous native components and APIs that come bundled with React Native including Images, Views, ListViews, WebViews, and much more. You will learn to utilize form inputs in React Native. You’ll get an overview of Facebook’s Flux data architecture and then apply Redux to manage data with a remote API. You will also learn to animate different parts of your application, as well as routing using React Native’s navigation APIs. By the end of the book, you will be able to build cutting-edge applications using the React Native framework.
Table of Contents (20 chapters)
Mastering React Native
Credits
Disclaimer
About the Authors
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Performance


When we refer to the performance of a mobile application, especially one that is not written in the native language, what we are most often talking about is framerate. It is generally accepted that the human eye can process up to 60 still frames per second (fps). When a series of images is displayed at or above this upper limit, we perceive it as motion instead of discreet images. With this in mind, our goal when optimizing the performance of an application is to ensure that the framerate never or rarely dips below 60 fps.

The practical implications of this requirement are that any blocking computation must complete within 16.67 milliseconds (1,000 milliseconds per 60 fps). Whenever we do something computationally expensive, for instance, rendering a new scene with many child components, there is a risk that the task will not complete in the allotted time. When this happens, we will drop a frame and the user will experience jitteriness or unresponsiveness as a result.

In React...