mapBetween関数sliding版

mapBetween2.scala

object mapBetween2 {
  def main(args:Array[String]) = {
    val range = 1 to 10
    println(mapBetween(range)(_+_) mkString ",")
    println(mapBetween(range)(_*_) mkString ",")
    println(mapBetween(range)(_-_) mkString ",")
  }

  def mapBetween[A,B,T>:A](seq:Seq[A])(f:(T,T)=>B): Iterator[B] = {
    seq.sliding(2).map(s=>f(s(0),s(1)))
  }
}