I am trying to pass in extra argument to a function that has a callback in parameter, to no avail

function loadMapService() {
  
      service = new google.maps.places.PlacesService(map);

      service.nearbySearch(request, callback);
    }
  }
}



function callback(results, status) {
  // do something 
}

I want to be able to pass something else into the function callbackwhen I execute the following function with the callback is parameter

service.nearbySearch(request, callback, somethingElse);


function callback(results, status, newArgument?) {
  //how to pass in the new argument properly and retrieve it?
}