HTML Code

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 21 - Try It</title>
</head>
<body>
  <h1>Alphabet diamond with stars</h1>
  <p>Edit <code>top</code> or replace <code>*</code>, then click Run.</p>

  <pre id="output"></pre>

  <script>
    (() => {
      const top = 5;
      let result = "";

      for (let i = 1; i <= top; i++) {
        let line = "";
        for (let j = 1; j < i * 2; j++) {
          line += j % 2 === 0 ? "*" : String.fromCharCode(i + 64);
        }
        result += line + "\n";
      }

      for (let i = top - 1; i >= 1; i--) {
        let line = "";
        for (let j = 1; j < i * 2; j++) {
          line += j % 2 === 0 ? "*" : String.fromCharCode(i + 64);
        }
        result += line + "\n";
      }

      document.getElementById("output").textContent = result;
    })();
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

JavaScript Alphabet Pattern 21 (Try It)