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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 47 - Try It</title>
</head>
<body>
  <h1>Concentric Number Diamond (5..1..5)</h1>
  <p>Edit the size and click Run.</p>
  <pre id="output"></pre>

  <script>
    const size = 5;
    const cols = 2 * size - 1;
    const center = size;
    let result = "";

    for (let r = 1; r <= cols; r++) {
      const level = r <= size ? size - r + 1 : r - size + 1;
      const row = [];

      for (let c = 1; c <= cols; c++) {
        const dist = Math.abs(center - c);
        const border = dist + 1;
        row.push(Math.max(level, border));
      }

      result += row.join(" ") + "\n";
    }

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

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JavaScript Number Pattern 47 (Try It)