HTML Code

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 45 - Try It (Diagonals Only)</title>
</head>
<body>
  <h1>X Pattern (Diagonals Only)</h1>
  <p>Edit <code>rows</code> and <code>cols</code>, then click Run.</p>
  <pre id="output"></pre>
  <script>
    const rows = 4;
    const cols = 9;
    let result = "";

    for (let i = 1; i <= rows; i++) {
      let line = "";
      for (let j = 1; j <= cols; j++) {
        if (i === j || i === cols + 1 - j) {
          line += "*";
        } else {
          line += "0";
        }
      }
      result += line + "\n";
    }

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

Lines: 0 | Characters: 0

Live Preview Auto-refresh on Run

JavaScript Number Pattern 45 (Try It — Diagonals Only)