recursion

:

scala

What is the result of code execution? def dropWhile[A](l: List[A], f: A => Boolean): List[A] = l match { case Cons(h, t) if f(h) => dropWhile(t, f) case _ => l } dropWhile(Nil, (x: Int) => x > 0) Assuming the following code is available for your reference sealed trait List[+A] case object Nil extends List[Nothing] case class Cons[+A](head: A, tail: List[A]) extends List[A]

scala

What is the result of code execution? def init[A](l: List[A]): List[A] = l match { case Nil => sys.error("init of empty list") case Cons(_, Nil) => Nil case Cons(h, t) => Cons(h, init(t)) } init(List(1, 2, 3)) Assuming the following code is available for your reference sealed trait List[+A] case object Nil extends List[Nothing] case class Cons[+A](head: A, tail: List[A]) extends List[A]

scala

What is the result of code execution? def init[A](l: List[A]): List[A] = l match { case Nil => sys.error("init of empty list") case Cons(_, Nil) => Nil case Cons(h, t) => Cons(h, init(t)) } init(List(1)) Assuming the following code is available for your reference sealed trait List[+A] case object Nil extends List[Nothing] case class Cons[+A](head: A, tail: List[A]) extends List[A]