Program to find longest sequence in Scala. Example: input- List(0,1,5,6,2), Output - 0,1,2

FindLongestSequence.scala

val longestSequence = (numList: List[Int]) => {
  val list = numList
    .map(x => {
      var n = 0; var list = List[Int]()
      while (numList.sorted.distinct.containsSlice(x to x + n)) {
        list = (x to x + n).toList; n += 1;
      }
      list
    })
    .map(x => (x, x.length))
    .sortBy(_._2)(Ordering.Int.reverse)(0)
    ._1
    .sorted(Ordering.Int.reverse)

  var n = 1
  var finalList = list
  while (numList.filter(_ == list.max - n).length > 1) {
    finalList = list.max - n :: finalList; n += 1
  }
  finalList.map(_.toString).reduce(_ + "," + _)
}
//Author: Niroj Pattnaik