Gist for ViewData best practice blog - Best way

MyViewModel.kt

sealed class MyViewData {

    abstract val distance: Int

    data class Km(override val distance: Int): MyViewData()

    data class Miles(override val distance: Int): MyViewData()
}

class MyViewModel: ViewModel() {

    private val _myViewData = MutableLiveData<MyViewData>()

    val myViewData: LiveData<MyViewData> = _myViewData

    fun updateViewData() {
        val value = getDistance()
        val distanceUnit = userPref.getDistanceUnit()
        _myViewData.value = when (distanceUnit) {
            KM -> MyViewData.Km(value)
            MILES -> MyViewData.Miles(value)
        }
    }
}