fork download 
  1. object Main{
  2. def doSomething(l : MyList, i : Int):MyList = {
  3.     l match {
  4.         case Nil() => Nil()
  5.         case Cons(e,tail) if e > i => Cons(e,doSomething(tail,i))
  6.         case Cons(e,tail)    => doSomething(tail,i)
  7.     }
  8. }
  9.  
  10. def doIt(l : MyList, i : Int) : MyList = {
  11.     (l,i) match {
  12.         case (Nil(),_)   => Nil()
  13.         case (_,0)           => Nil()
  14.         case (Cons(e,t),j) => Cons(e,doIt(t,j-1))
  15.     }
  16. }
  17. def main(args: Array[String]) {
  18. val l = Cons(13,Cons(23,Cons(17,Nil())))
  19.     for( i <- 1 to 5) println(doIt(l,i))
  20. }
  21. }
  22. abstract case class MyList
  23.  
  24. case class Nil extends MyList
  25.  
  26. case class Cons(cur : Int , follow : MyList) extends MyList
  27.  
  28. object MyList {
  29.   def push(n : Int, l : MyList):MyList = {
  30.     Cons(n,l)
  31.   }
  32.   def tail(l : MyList) : MyList = {
  33.     l match{
  34.       case Nil() => Nil()
  35.       case Cons(c,f) => f
  36.     }
  37.   }
  38.     def pop(l : MyList) : (Int,MyList) = {
  39.       l match{
  40.       case Nil() => throw new IllegalArgumentException("wrong parameter")
  41.       case Cons(c,f) => (c,f)
  42.       }
  43.     }
  44. }
Success #stdin #stdout 0.19s 211776KB
comments (?)
stdin 
Standard input is empty
stdout 
Cons(13,Nil())
Cons(13,Cons(23,Nil()))
Cons(13,Cons(23,Cons(17,Nil())))
Cons(13,Cons(23,Cons(17,Nil())))
Cons(13,Cons(23,Cons(17,Nil())))
https://ideone.com/02blY
language:
Scala (scala 2.12.8)
created:
14 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!