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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>Decimal to binary — bit scan</title>
</head>
<body>
  <h1>MSB-to-LSB bit scan</h1>
  <p>Edit <code>samples</code>, then click <strong>Run</strong>.</p>
  <pre id="out"></pre>
  <script>
    (function () {
      function bitLength(n) {
        if (n === 0) return 0;
        return Math.floor(Math.log2(n)) + 1;
      }
      function toBinaryBitScan(n) {
        if (n === 0) return "0";
        var highest = bitLength(n) - 1;
        var out = [];
        for (var b = highest; b >= 0; b--) {
          var bit = (n >> b) & 1;
          out.push(bit ? "1" : "0");
        }
        return out.join("");
      }
      var samples = [15, 64];
      var lines = [];
      for (var i = 0; i < samples.length; i++) {
        var n = samples[i];
        lines.push(n + " as binary: " + toBinaryBitScan(n));
      }
      document.getElementById("out").textContent = lines.join("\n");
    })();
  </script>
</body>
</html>

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JavaScript Decimal to Binary — bit scan (Try It)