Codility MinAvgTwoSlice (https://codility.com/demo/results/demoSHZX7K-8T2/) (http://geeks.aretotally.in/codility-minavgtwoslice-in-scala/)

CodilityMinAvgTwoSlice.scala

object Solution {
    def solution(A: Array[Int]): Int = {

        (A.foldLeft[(Int, Option[Double], Int)]((0, None, -1)) { (t, item) =>
          val (index, min, results) = t

          val checkPair = index <= A.size - 2
          val checkTrio = index <= A.size - 3

          val pairMin = checkSlice(min, checkPair) { () => (A(index) + A(index + 1)) / 2.0 }
          val trioMin = checkSlice(min, checkTrio) { () => (A(index) + A(index + 1) + A(index + 2)) / 3.0 }

          if (pairMin.isDefined || trioMin.isDefined) (index + 1, Some(Math.min(pairMin.getOrElse(Double.MaxValue), trioMin.getOrElse(Double.MaxValue))), index)
          else (index + 1, min, results)
        })._3
    }

    def checkSlice(min: Option[Double], check: Boolean)(f: () => Double) = {
      check match {
        case true =>
          val value = f()
          min map { minValue =>
            if (value < minValue) Some(value)
            else None
          } getOrElse Some(value)

        case false =>
          None
      }
    }
}