LoginViewModel.kt

val email = MutableStateFlow("")
    val password = MutableStateFlow("")
    val isEmailAndPasswordValid = MutableStateFlow(false).apply {
        viewModelScope.launch {
            combine(email, password) { n1, n2 ->
                validate(n1, n2)
            }.collect { isValid ->
                value = isValid
            }
        }
    }

    private fun validate(name: String, password: String) =
        name.isNotEmpty() && password.isNotEmpty()