PersistTheList6.kt

fun <E> dropWhile(list: List<E>, f: (E) -> Boolean): List<E> =
    when(list) {
        Empty -> Empty
        is Cons -> if (f(list.head)) dropWhile(list.tail, f) else list
    }


fun main() {
    val myList = Cons(1, Cons(2, Cons(3, Cons(4, Empty))))
    dropWhile(myList) { it < 3 }.let(::println)
    dropWhile(myList) { it < 1 }.let(::println)
    dropWhile(myList) { it < 10 }.let(::println)
}