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Richard Feldman - Developing a React.js Edge : the JavaScript Library for User Interfaces

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Richard Feldman Developing a React.js Edge : the JavaScript Library for User Interfaces
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Developing a React Edge, Second Edition

Copyright (c) 2015 Bleeding Edge Press

All rights reserved. No part of the contents of this book may be reproduced or transmitted in any form or by any means without the written permission of the publisher.

This book expresses the authors views and opinions. The information contained in this book is provided without any express, statutory, or implied warranties. Neither the authors, Bleeding Edge Press, nor its resellers, or distributors will be held liable for any damages caused or alleged to be caused either directly or indirectly by this book.

ISBN 9781939902290

Published by: Bleeding Edge Press, Santa Rosa, CA 95404

Title: Developing a React Edge, Second Edition

Authors:Richard Feldman, Frankie Bagnardi, Simon Hjberg, Jeremiah Hall

Editor: Troy Mott

Copy Editor: Christina Rudloff

Typesetter: Bob Herbstman

Cover Designer: Ellie Volckhausen

Website: bleedingedgepress.com

Preface
What is React and why should you use it?

React is a JavaScript library developed internally at Facebook and open sourced in 2013 for building interactive user interfaces for the web. It introduces a new way to deal with the Browsers DOM. Gone are the days of manually updating the DOM and laboriously keeping track of each piece of state that makes scalability and new feature development at best, a risky endeavor. Instead, React deals with the DOM in a very novel way. You declaratively define your user interface at any point in time. React removes the need to worry about which part of the DOM needs to update when data changes, and enables you to essentially re-render your entire application at any point in time with minimal DOM changes.

How this book helps

React introduces new and exciting concepts that challenge current practices. This book will enable you to navigate all of these concepts and help you understand why they are beneficial and can help you build scalable Single Page Applications (SPAs).

React focuses mainly on the view part of an application, and thus does not prescribe server communication or code organization. In this book we will cover the current best practices and complementary tools to help you build a complete application with React.

What do you need to know prior to reading the book?

To get the most out of this book youll need to be experienced with JavaScript and HTML. Its beneficial if you have experience with writing SPAs (regardless of which framework like Backbone.js, AngularJS, or Ember.js), but it is not required.

Source code and sample application

Throughout this book well be referencing bits of our example application: reddit clone. You can read the full source code at http://git.io/vlcpa and view an online demo at http://git.io/vlCUI

The writing process

This book was written as a focused virtual book sprint over the course of a month or two. This process helps create fresh and current content, whereas conventional books often lag behind the coverage of cutting edge trends and technology.

In the second edition everything has been updated to React 0.14 and a new sample application has been created.

Authors

The book is written by a team of experienced and dedicated JavaScript developers:

Richard Feldman is the lead Front-End Engineer at NoRedInk an education tech - photo 1

Richard Feldman is the lead Front-End Engineer at NoRedInk, an education tech company in San Francisco. He is a functional programming enthusiast, a conference speaker, and the author of seamless-immutable, an open-source library that provides immutable data structures that are backward-compatible with normal JavaScript objects and arrays. He is @rtfeldman on both Twitter and GitHub.


Frankie Bagnardi is a Senior Front-end Developer creating user experiences for - photo 2

Frankie Bagnardi is a Senior Front-end Developer creating user experiences for various clients. In his free time, he answers questions on StackOverflow (FakeRainBrigand) and IRC (GreenJello), and enjoys small projects. You can reach him at .


Simon Hjberg is a Senior UI Engineer at Swipely in Providence RI He is the - photo 3

Simon Hjberg is a Senior UI Engineer at Swipely in Providence, RI. He is the co-organizer of the Providence JS Meetup group and former JavaScript instructor at Startup Institute Boston. He spends his time building functional User Interfaces with JavaScript, and hacking on side projects like cssarrowplease.com. Simon tweets at @shojberg.


Jeremiah Hall is a Senior Software EngineerArchitect currently at OpenGov Inc - photo 4

Jeremiah Hall is a Senior Software Engineer/Architect currently at OpenGov Inc. He is also the founder of Aspect Apps, building a journaling application that uses React Native and JavaScript for the UI. He can be found on Twitter @ jeremiahrhall .

Chapter 1. Introduction to React
Background

In the early days of Web development, front-end code bases were small and JavaScript was underpowered. Thanks to years of browsers one-upping each other to push the envelope on JavaScript performance, todays web apps can deliver user experiences on par with those of native apps. As web apps continue to grow richer and more ambitious, scaling JavaScript code bases while maintaining strong performance is now a bigger challenge than ever.

Historically, many JavaScript libraries have prioritized performance or code organizationby making it easier to do high-performance DOM operations across browsers, or by offering organizational patterns that make code easier to scale. React has soared in popularity by making it easy to achieve both performance improvements and code scaling at the same time. This potent combination has made it one of the top ten most popular libraries across all of GitHub.

React started as a port of a PHP framework by Facebook called XHP. Being a PHP framework, XHP was designed to render your entire page every time a request was made. React was born to bring the PHP style work flow of re-rendering the entire page to client side applications.

React is essentially a state machine, helping you manage the complexity of state changing over time. It achieves this by having a very narrow scope. It is concerned with only two things:

  1. Updating the DOM
  2. Responding to events

React has no opinions on AJAX, routing, storage, or how to structure your data. It is not a Model-View-Controller framework; if anything, it is the V in MVC. This narrow scope gives you the freedom to incorporate React into a wide variety of systems. In fact, it has been used to render views in several popular MVC frameworks.

Rendering the entire page every time some state changes is incredibly slow in JavaScript due to the performance penalty of reading and updating the DOM. React has a very powerful rendering system that uses a virtual DOM, resulting in React only needing to update the DOM and not read from the DOM.

Like high-performance 3D game engines, React is built around render functions that take the state of the world and translate it into a virtual representation of the resulting page. Whenever React is informed of a state change, it re-runs those functions to determine a new virtual representation of the page, then automatically translates that result into the necessary DOM changes to reflect the new presentation.

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