temperatureAvg2.scala

import scala.math.abs
// 気温リスト1~12月
val temperatureSeq:Seq[Int] =
  Seq(4, 5, 11, 17, 19, 22, 28, 28, 22, 19, 14, 7)
def diffTemperature2(tSeq: Seq[Int]) = {
  tSeq.sliding(2).foldLeft(Seq.empty[Int])((totalSeq, numSeq) =>
    totalSeq :+ abs(numSeq.head - numSeq.last)
  )
}
diffTemperature2(temperatureSeq)
// -> res0: Seq[Int] = List(1, 6, 6, 2, 3, 6, 0, 6, 3, 5, 7)