JavaScript - Decode

function decodeLine(encoded) {
          var len = encoded.length;
          var index = 0;
          var array = [];
          var lat = 0;
          var lng = 0;

          while (index < len) {
            var b;
            var shift = 0;
            var result = 0;
            do {
              b = encoded.charCodeAt(index++) - 63;
              result |= (b & 0x1f) << shift;
              shift += 5;
            } while (b >= 0x20);
            var dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
            lat += dlat;

            shift = 0;
            result = 0;
            do {
              b = encoded.charCodeAt(index++) - 63;
              result |= (b & 0x1f) << shift;
              shift += 5;
            } while (b >= 0x20);
            var dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
            lng += dlng;

            array.push([lat * 1e-5, lng * 1e-5]);
          }

          return array;
        }