React Js String startsWith() Method

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        function App() {
            const string = "1234567890";
            const isNumber = string.startsWith("1");

return (
                <div className='container'>
                    <h3>React Js String startsWith() Method - Checking if a string starts with a number</h3>
                    <p>{isNumber ? "The string starts with '1'" : "The string does not start with '1'"}</p>
                   
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById('app'));
    </script>
    <style>
        .container {
            width: 600px;
            margin: 0 auto;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }
    </style>
</body>

</html>