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<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 57 - Try It (Compact)</title>
</head>
<body>
  <h1>Diagonal Mirror Number Pyramid (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 = rows; j >= 1; j--) {
        line += (i === j) ? i : " ";
      }

      for (let k = 2; k <= rows; k++) {
        line += (i === k) ? i : " ";
      }

      result += line + "\n";
    }

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

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JavaScript Number Pattern 57 (Try It — Compact rows = 3)