React Js Array Includes Method

<!DOCTYPE html>
<html>

</head>

<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState } = React;

function App() {
        const array = [1, 2, 3, 4, 5];
            const startIndex = 2;
            const elementToCheck = 3;

const isElementExists = array.includes(elementToCheck, startIndex);

return (
                <div className='container'>
                    <h3>React Js includes Method</h3>
                     {isElementExists ? (
                        <p>
                            Element {elementToCheck} exists in the array starting from index {startIndex}.
                        </p>
                    ) : (
                        <p>
                            Element {elementToCheck} does not exist in the array starting from index {startIndex}.
                        </p>
                    )}
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById('app'));
    </script>
    <style>
        .container {
            width: 400px;
            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>