Reactjs hello world

reactjs hello world
===============================
npx create-react-app myapp
cd myapp
npm start
http://localhost:3000/
-----------------------------
* check version
node -v
npm -v
* npm upgrade
npm i -g npm-upgrade

Source: ashabbsoftmart.firebaseapp.com

Hello world react

Page HTML :
    <div id = "root"> </div>

Page JS BABEL:
  ReactDOM.render(<h1> Hello , world ! </h1> , document.getElementById('root') );

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