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<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 53 - Try It (Compact)</title>
</head>
<body>
  <h1>Mirror Diagonal Number Pattern (rows = 3)</h1>
  <p>Edit <code>rows</code> for a quick trace, then click Run.</p>
  <pre id="output"></pre>
  <script>
    const rows = 3;
    let result = "";

    for (let i = 1; i <= rows; i++) {
      let line = "";

      for (let j = 1; j <= rows; j++) {
        line += (i === j ? i : " ");
      }

      for (let k = rows - 1; k >= 1; k--) {
        line += (i === k ? i : " ");
      }

      result += line + "\n";
    }

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

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JavaScript Number Pattern 53 (Try It — Compact rows = 3)