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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Even — single n</title>
</head>
<body>
  <h1>Single even check</h1>
  <p>Edit <code>number</code> in the script, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function isEven(number) {
        return number % 2 === 0;
      }
      var number = 10;
      var msg = isEven(number)
        ? number + " is an even number."
        : number + " is not an even number.";
      document.getElementById("out").textContent = msg;
    })();
  </script>
</body>
</html>

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JavaScript Even Number — Single check (Try It)