1 package object lib {

     2 

     3 //some list functions

     4 def tl[A](xs: List[A]) : List[A] = xs match {

     5   case Nil => Nil

     6   case x::xs => xs

     7 }

     8 

     9 def hd[A](xs: List[A]) : A = xs.head

    10 

    11 def nth_of[A](xs: List[A], n: Int) = 

    12   if (n <= xs.length) Some(xs(n)) else None 

    13 

    14 //some map functions

    15 def dget(m: Map[Int, Int], n: Int) = m.getOrElse(n, 0)

    16 

    17 //some string functions

    18 def join[A](xs: List[A]) = xs.foldLeft("")(_.toString + _)

    19 

    20 }