BasicLiveData_02.kt

class SomeViewModel(private val getUserUseCase: GetUserUseCase) : ViewModel() {
  
  // Only your viewmodel should update the value.
   private val _user: MutableLiveData<User> = MutableLiveData()
   val userName: LiveData<String> = _user.map {
     resultUser -> "${resultUser.name} + ${resultUser.lastName}" 
   }
  
  ...
  
  private fun executeUseCase() {
    _user.value = getUserUseCase.someComputation()
  }
}