HTML Code

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Alphabet Pattern 34 - Try It (Browser)</title>
</head>
<body>
  <h1>Diamond (document.write)</h1>
  <p>Edit the loops, then click Run.</p>

  <script>
    const A = 65;
    const last = 69;

    function printRow(i) {
      for (let j = last; j >= A; j--) {
        if (i === j) document.write(String.fromCharCode(j));
        else document.write("&nbsp;&nbsp;");
      }
      for (let k = A + 1; k <= last; k++) {
        if (i === k) document.write(String.fromCharCode(k));
        else document.write("&nbsp;&nbsp;");
      }
      document.write("<br>");
    }

    for (let i = A; i <= last; i++) printRow(i);
    for (let i = last - 1; i >= A; i--) printRow(i);
  </script>
</body>
</html>

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

JavaScript Alphabet Pattern 34 (Try It — Browser)