Google PlayGround

internet-profile.kt

fun main() {    
    val amanda = Person("Amanda", 33, "play tennis", null)
    val atiqah = Person("Atiqah", 28, "climb", amanda)
    
    amanda.showProfile()
    atiqah.showProfile()
}


class Person(val name: String, val age: Int, val hobby: String?, val referrer: Person?) {
    fun showProfile() {
       
       val msg = "Name: $name\nIdade: $age\n${hobbyMsg()} ${referrerMsg()}\n"
        println(msg)
    }
    private fun myReferrerMsg() = "Has a referrer named $name how likes to $hobby."
    private fun hobbyMsg() = if (hobby != null) "Likes to $hobby." else ""
    private fun referrerMsg() = if (referrer == null) "Does not have a referrer" else referrer?.myReferrerMsg() 
}