observerPattern.kt

val currentLocation: Observable<LatLong> = TODO("the platform API keeps sending signal to this object")

currentLocation.subscribeBy(
  onNext -> { latLong -> moveThePin(latLong) }, 
  onError -> { throwable -> TODO("tell user that current location is not retrievable or something") }, 
  onComplete -> { TODO("this is the end of the transmission, turn it off or something") })

fun moveThePin(latLong: LatLong) { TODO("move the Pin") }