Basic React hook snippet.

``` <!– begin snippet: js hide: false console: true babel: true –>

<!– language: lang-js –>

  const {
    useState,
    useEffect
  } = React;

  function ExampleComponent(props) { 
    return <div>
        Hello World!
      </div>; 
  }

  const el = document.querySelector("#root");
  ReactDOM.render(<ExampleComponent/>, el);

<!– language: lang-html –>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.6/umd/react.production.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.6/umd/react-dom.production.min.js"></script>

  <div id="root"></div>

<!– end snippet –> ```