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<!DOCTYPE html>
<html lang=en>
<head>
  <meta charset=utf-8>
  <title>Binary — Horner</title>
</head>
<body>
  <h1>Horner on string</h1>
  <p>Edit <code>bits</code> (0 and 1 only), then <strong>Run</strong>.</p>
  <pre id=out></pre>
  <script>
    (function () {
      function binaryStringToDecimal(s) {
        if (s == null || s.length === 0) {
          return -1;
        }
        var v = 0;
        for (var i = 0; i < s.length; i++) {
          var c = s[i];
          if (c !== "0" && c !== "1") {
            return -1;
          }
          v = v * 2 + (c === "1" ? 1 : 0);
        }
        return v;
      }
      var bits = "101010";
      var dec = binaryStringToDecimal(bits);
      var msg =
        dec < 0
          ? "Invalid binary string."
          : "Binary (string): " + bits + "\nDecimal: " + dec;
      document.getElementById("out").textContent = msg;
    })();
  </script>
</body>
</html>

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JavaScript Binary to Decimal — Horner string (Try It)