React Js Array fill Method

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        function App() {
            const originalArray = Array(6).fill().map((_, index) => index + 1);
            // Filling an array with a computed value
            const filledComputedArray = originalArray.map((value, index) => value * index);

return (
                <div className="container">
                    <h1>React Js Array fill() Method</h1>
                    <h2>Original Array: {originalArray.join(', ')}</h2>
                    <h3>Filled Computed Array: {filledComputedArray.join(', ')}</h3>
                </div>
            );
        }

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

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

h1 {
            font-size: 24px;
            color: #333;
        }

h2 {
            font-size: 18px;
            color: #666;
            margin-top: 10px;
        }

h3 {
            font-size: 16px;
            color: #999;
            margin-top: 10px;
        }
    </style>
</body>

</html>