[Kotlin] Class

 class Person (val name: String, var age: Int) {
     init {}
     
     fun greeting(pn: String) {
         println("$name says hello to $pn")
     }
 }

fun main() {
    val p = Person("Jack", 23)
    p.greeting("Wan")
}

With named parameters:

 class Person (val name: String = "", var age: Int = 23) {
     init {}
     
     fun greeting(pn: String) {
         println("$name says hello to $pn")
     }
 }

fun main() {
    val p = Person(age=23, name="Jack")
    p.greeting("Wan")
}