Builders in Kotlin. Gist 6

Person.kt

class Person(val name: String, val surname: String, val age: Int = 0)

Person(name = "Peter", surname = "Slesarew") // <- name, surname are mandatory
Person(name = "Peter") // <- it does not compile
Person(surname = "Slesarew") // <- it does not compile
Person(age = 28) // <- it does not compile