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  1.  
  2. //zadanie 1
  3. //def exists[A](xs:List[A])(p:A=>Boolean):Boolean=
  4. //xs match {
  5. //  case h::t => if(p(h)) true else exists(t)(p)
  6. //  case Nil => false
  7. //}
  8. //
  9. //exists (List(5,1,2,3)) (_ == 2)  ==   true
  10. //exists (List(5,1,2,3)) (_ == 6)  ==   false
  11. //exists (List()) (_ == 6)  ==   false
  12. //
  13. //def existsFL[A](xs:List[A])(p:A=>Boolean):Boolean=
  14. //  (xs foldLeft false)((x:Boolean,y:A)=> x || p(y))
  15. //
  16. //existsFL (List(5,1,2,3)) (_ == 2)  ==   true
  17. //existsFL (List(5,1,2,3)) (_ == 6)  ==   false
  18. //existsFL (List()) (_ == 6)  ==   false
  19. //
  20. //def existsFR[A](xs:List[A])(p:A=>Boolean):Boolean=
  21. //  (xs foldRight false)((x:A, y:Boolean)=> y || p(x))
  22. //
  23. //existsFR (List(5,1,2,3)) (_ == 2)  ==   true
  24. //existsFR (List(5,1,2,3)) (_ == 6)  ==   false
  25. //existsFR (List()) (_ == 6)  ==   false
  26. //
  27. //zadanie2
  28. //def filter[A](xs:List[A])(p:A=>Boolean):List[A]=
  29. //  (xs foldRight List[A]()) ((x:A, y:List[A]) => if(p(x)) x::y else y)
  30. //
  31. //filter (List(2,7,1,3,7,8,4,1,6,9)) (_ > 3) == List(7, 7, 8, 4, 6, 9)
  32. //filter (List(0)) (_ > 3) == List()
  33. //
  34. //zadanie3
  35. //def remove1[A](xs:List[A])(p:A=>Boolean):List[A]=
  36. //  xs match {
  37. //    case h::t => if(p(h)) t else h::remove1(t)(p)
  38. //    case _ => Nil
  39. //}
  40. //
  41. //remove1(List(1,2,3,2,5)) (_ == 2) == List(1, 3, 2, 5)
  42. //remove1(List(1,2,3,2,5)) (_ == 6) == List(1,2,3,2,5)
  43. //remove1(List()) (_ == 6) == List()
  44. //
  45. //
  46. //zadanie4
  47. //def splitAt[A](xs:List[A])(n:Int):(List[A],List[A])= {
  48. //  def splitAtAcc(xs: List[A])(acc1: List[A], acc2: List[A])(n: Int)
  49. //  : (List[A], List[A]) =
  50. //    xs match {
  51. //      case h :: t if n > 0 => splitAtAcc(t)(h::acc1, acc2)(n-1)
  52. //      case _ => (acc1.reverse, xs)
  53. //    }
  54. //  splitAtAcc(xs)(List(), List())(n)
  55. //}
  56. //
  57. //splitAt (List('a','b','c','d','e')) (2)
  58. //splitAt (List('a','b','c','d','e')) (2) == (List('a', 'b'), List('c', 'd', 'e'))
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