React js Check array or object is undefined

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8" />
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.2/umd/react.production.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.2/umd/react-dom.production.min.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 { useState} = React
        function App() {
            const [myArray, setMyArray] = useState(undefined);
          return (
                <div className='container'>
                    <h3>React Js Check array is undefined</h3>
                    {myArray === undefined ? (
                        <p>The array is undefined.</p>
                    ) : myArray.length === 0 ? (
                        <p>The array is empty.</p>
                    ) : (
                        <p>The array has {myArray.length} items.</p>
                    )}
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }

body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
        }

.container {
            text-align: center;
            padding: 20px;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            margin: 0 auto;
            width: 600px;
            margin: 0 auto
        }
    </style>
</body>

</html>