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<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 19 - Try It (Explicit)</title>
</head>
<body>
  <h1>Mirrored Alphabet (Explicit Gap)</h1>
  <p>Edit n or the letter/gap/mirror loops, then click Run.</p>
  <pre id="output" style="font-family: monospace; white-space: pre;"></pre>
  <script>
    const n = 4; // last index (E)
    const base = "A".charCodeAt(0);
    let result = "";

    for (let i = 0; i <= n; i++) {
      let line = "";
      for (let j = 0; j <= i; j++) {
        line += String.fromCharCode(base + j);
      }
      for (let g = 0; g < 2 * (n - i); g++) {
        line += " ";
      }
      for (let k = i; k >= 0; k--) {
        line += String.fromCharCode(base + k);
      }
      result += line + "\n";
    }

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

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JavaScript Alphabet Pattern 19 (Try It - Explicit Gap)