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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 44 - Try It (Compact)</title>
</head>
<body>
  <h1>Centered Number Diamond (rows = 3)</h1>
  <p>Edit <code>rows</code> and click Run.</p>
  <pre id="output"></pre>
  <script>
    const rows = 3;
    let result = "";

    for (let i = 1; i <= rows; i++) {
      let line = " ".repeat(rows - i);
      for (let k = 1; k < 2 * i; k++) {
        line += k;
      }
      result += line + "\n";
    }

    for (let i = rows - 1; i >= 1; i--) {
      let line = " ".repeat(rows - i);
      for (let k = 1; k < 2 * i; k++) {
        line += k;
      }
      result += line + "\n";
    }

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

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JavaScript Number Pattern 44 (Try It — Compact Demo)