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ReactJS by Example - Building Modern Web Applications with React

You're reading from   ReactJS by Example - Building Modern Web Applications with React Building Modern Web Applications with React

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Product type Paperback
Published in Apr 2016
Publisher Packt
ISBN-13 9781785289644
Length 280 pages
Edition 1st Edition
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Author (1):
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Vipul A M Vipul A M
Author Profile Icon Vipul A M
Vipul A M
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Toc

Table of Contents (15) Chapters Close

Preface 1. Getting Started with React FREE CHAPTER 2. JSX in Depth 3. Data Flow and Life Cycle Events 4. Composite Dynamic Components and Forms 5. Mixins and the DOM 6. React on the Server 7. React Addons 8. Performance of React Apps 9. React Router and Data Models 10. Animation 11. React Tools 12. Flux 13. Redux and React Index

The PERF addon


"Let's start with installing the PERF addon."

$ npm install react-addons-perf --save-dev

"We need this add-on only in the development mode. This is an important point to remember because in production, we don't need the debugging information as it may make our app slow." informed Mike.

"Shawn, the PERF add-on can be used to see what changes React is doing with the DOM, where is it spending time while rendering our app, is it wasting some time while rendering, and so on. This information can then be used to improve the performance of the app." said Mike.

"Let's start by exposing the PERF add-on as a global object. We can use it in the browser console while our app is running to see how React is making changes as per the user interactions." explained Mike.

// index.js
import ReactDOM from 'react-dom';
import React from 'react';
import App from './App';
import Perf from 'react-addons-perf';

window.Perf = Perf;

ReactDOM.render(<App />, document.getElementById('rootElement...
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