findGaps

gistfile1.scala

scala> List(3,4,5,8,9,10,12).sliding(2).collect{  case Seq(x, y) if(y != x + 1) => (x,y) }
res39: Iterator[(Int, Int)] = non-empty iterator

scala> .foreach(println(_) )
(5,8)
(10,12)


scala> def findGaps[T <: Int](xs:List[T])  = xs.sliding(2).collect{  case Seq(x, y) if(y != x + 1) => (x,y) }
findGaps: [T <: Int](xs: List[T])Iterator[(T, T)]

scala> findGaps(List(3,4,5,8,9,10,12))
res41: Iterator[(Int, Int)] = non-empty iterator

scala> .foreach(println(_) )
(5,8)
(10,12)