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<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery.map() — uppercase</title>
</head>
<body>
  <h1>Uppercase + index</h1>
  <pre id="out"></pre>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    (function () {
      var formatted = $.map(["a", "b", "c", "d", "e"], function (n, i) {
        return n.toUpperCase() + i;
      });
      document.getElementById("out").textContent = formatted.join(", ");
    })();
  </script>
</body>
</html>

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jQuery.map() — uppercase with index (Try It)