ho to find your react verion/ code example
Example 1: how to check reactjs version in command prompt
npm list react
Example 2: find react version
const REACT_VERSION = React.version;
ReactDOM.render(
<div>React version: {REACT_VERSION}</div>,
document.getElementById('root')
);
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>