BasicLiveData_01.kt

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