I'm checking users locations with HTML Geolocation before unlocking the front door. Geolocation takes a few seconds in addition to the time it takes the user to approve it, so currently I have a callback for what to do next.

function getLocationWithCallbacks(callback, error_callback) {
  navigator.geolocation.getCurrentPosition(
      function (position) {
        let location = { "latitude": position.coords.latitude, "longitude": position.coords.longitude };
        callback(location);
      },
      function (error) {
        if (error.code === error.PERMISSION_DENIED)
          error_callback()
      }
  )
}

And I call this function like so..

getLocationWithCallbacks(unlock_request, get_location_denied);

However, I'm not sure if there's a more logical way than this. It would be nice if events happened in a more linear fashion like ("pseudo code")...

function getLocation() {
  navigator.geolocation.getCurrentPosition(
   function(position) { return ['success', position] },
   function(error) { return ['failure', error] }
}

And invoke it with...

let response = getLocation();
response[0] === 'success' ? unlock_request(response[1]) : get_location_denied(response[1])

However I believe this would involve adding promises and await statements which might make the original callback method more desirable.

I'm just not sure what's the cleanest, most logical way of implementing a getLocation function?