pattern matching

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scala

What is the result of code execution? def drop[A](l: List[A], n: Int): List[A] = if (n <= 0) l else l match { case Nil => Nil case Cons(_, t) => drop(t, n - 1) } drop(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]

pattern matching

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(List(1, 2, 3), (x: Int) => x < 2) 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]

pattern matching

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(List(1, 2, 3), (x: Int) => x > 2) 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]

pattern matching

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(List(1, 2, 3), (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]

pattern matching

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]

pattern matching

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]

pattern matching

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]

pattern matching