package com.learner.s99

object P03 {
  def nth(n: Int, l: List[Any]): Any = {
    require(n >= 0, "n must be greater than or equal to zero")
    l match {
      case List() => None
      case head :: tail if n == 0 => head
      case head :: tail if n > 0 => nth(n - 1, tail)
    }
  }
}