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<html>
<head>
  <meta charset="utf-8">
  <title>JS Number Pattern 31 - Try It</title>
</head>
<body>
  <h1>Number + Asterisk Diamond Pattern</h1>
  <p>Edit <code>max</code> and click Run.</p>
  <pre id="output"></pre>
  <script>
    const max = 5;
    let result = "";
    function row(i) {
      let line = "";
      for (let j = 1; j < i * 2; j++) {
        line += (j % 2 === 0) ? "*" : String(i);
      }
      return line;
    }
    for (let i = 1; i <= max; i++) {
      result += row(i) + "\n";
    }
    for (let i = max - 1; i >= 1; i--) {
      result += row(i) + "\n";
    }
    document.getElementById("output").textContent = result;
  </script>
</body>
</html>

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JavaScript Number Pattern 31 (Try It)