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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=utf-8>
  <title>Power of 2 check</title>
</head>
<body>
  <h1>Power of 2 check</h1>
  <pre id=out></pre>
  <script>
    (function () {
      function isPowerOfTwo(num) {
        return num > 0 && (num & (num - 1)) === 0;
      }
      var number = 16;
      var lines = [];
      lines.push("Input: " + number);
      lines.push(isPowerOfTwo(number) ? number + " is a power of 2." : number + " is not a power of 2.");
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Power of 2 — Single Number (Try It)