Two ways to create async functions in ViewModel class

Coroutines2.kt

class LoginViewModel(context: Application) : AndroidViewModel(context) {

...

  fun isUserExists(id: Int) = viewModelScope.async {
    usersRepository.isUserExists(id)
  }

  // But you can also write this way:
  suspend fun isUserExists(id: String): Int  {
    val res = viewModelScope.async {
      usersRepository.isUserExists(id)
    }
    return res.await()
  }
}