React Map example with index

<!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://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
  </head>

<body>
    <div id="app"></div>
    <script type="text/babel">
      function App() {
        // Sample list of items
        const items = ["Apple", "Banana", "Orange", "Grapes"];

return (
          <div className="container">
            <h1>React Map example with index </h1>
            <h3>My List of Fruits</h3>
            <ul>
              {items.map((item, index) => (
                <li key={index}>{`${index + 1}. ${item}`}</li>
              ))}
            </ul>
          </div>
        );
      }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>

/* Styling for the heading */
      .container h1 {
        font-size: 24px;
        text-align: center;
        margin-bottom: 20px;
      }

/* Styling for the list */
      .container ul {
        list-style: none;
        padding: 0;
        margin: 0;
      }

/* Styling for the list items */
      .container li {
        font-size: 18px;
        margin-bottom: 8px;
      }
      /* Styling for odd-indexed list items (alternating background) */
      .container li:nth-child(odd) {
        background-color: #f9f9f9;
        padding: 8px;
        border-radius: 4px;
      }
    </style>
  </body>
</html>

 
<!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://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
  </head>
​
  <body>
    <div id="app"></div>
    <script type="text/babel">
      function App() {
        // Sample list of items
        const items = ["Apple", "Banana", "Orange", "Grapes"];
​
        return (
          <div className="container">
            <h1>React Map example with index </h1>
            <h3>My List of Fruits</h3>
            <ul>
              {items.map((item, index) => (
                <li key={index}>{`${index + 1}. ${item}`}</li>
              ))}
            </ul>
          </div>
        );
      }
​
      ReactDOM.render(<App />, document.getElementById("app"));
    </script>
​
    <style>
      #app {
        margin: 0 auto;
        width: 500px;
        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);
      }
​
      /* Styling for the heading */
      .container h1 {
        font-size: 24px;
        text-align: center;
        margin-bottom: 20px;
      }
​
      /* Styling for the list */
      .container ul {
        list-style: none;
        padding: 0;
        margin: 0;
      }
​
      /* Styling for the list items */
      .container li {
        font-size: 18px;
        margin-bottom: 8px;
      }
      /* Styling for odd-indexed list items (alternating background) */
      .container li:nth-child(odd) {
        background-color: #f9f9f9;
        padding: 8px;
        border-radius: 4px;
      }
    </style>
  </body>
</html>
​