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// domain:
class PhoneNumber(val value: String)
class Contact(val phoneNumber: PhoneNumber)
// screen:
class PhoneNumberScreen(
private val phoneNumber: PhoneNumber
) {
fun render() {
println("Phone number: ${phoneNumber.value}")
// presentation layer:
fun main() {
val contact = Contact(PhoneNumber("12345"))
show(contact.phoneNumber) // "Phone number: 12345"
val contactWithInvalidPhoneNumber = Contact(PhoneNumber(""))
show(contactWithInvalidPhoneNumber.phoneNumber) // "Phone number: "
private fun show(phoneNumber: PhoneNumber) {
val phoneNumberScreen = PhoneNumberScreen(phoneNumber)
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