React js Check if an Element contains a class

<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8" />
  <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
  <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.26.0/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">
    const { useRef } = React;
    function App() {
      const myElementRef = useRef(null);

const checkClass = () => {
        if (myElementRef.current.classList.contains('my-class')) {
          alert('The element contains the class "my-class"');
        } else {
          alert('The element does not contain the class "my-class"');
        }
      };

return (
        <div className='container'>
          <h3>React js Check if an Element contains a class </h3>
          <div ref={myElementRef} className="my-class">Sample Element</div>
          <button onClick={checkClass}>Check Class</button>
        </div>
      );
    }
    ReactDOM.render(<App />, document.getElementById('app'));
  </script>

<style>
    .container {
      max-width: 500px;
      margin: 0 auto;
      padding: 20px;
      border-radius: 8px;
      box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
      text-align: center;
    }
  </style>
</body>

</html>