Scala : Remove consecutive duplicates from List

object scalaprolog extends App { var list2=List(1,2,2,2,3,3,4,5,6,7,7,8,7,2,2) def duplicate(l:List[Int]):List[Int]= { var testlist=scala.collection.mutable.ListBuffer.empty[Int] testlist += l(0) //testlist.toList def loop(lis:List[Int],n:Int):List[Int]= { if(n<list2.length) { //println(n) if (testlist.last != lis(n)) {println(testlist.last,lis(n)) testlist +=lis(n) //loop(lis,n+1) } loop(lis,n+1) } testlist.toList } loop(list2,0) testlist.toList } println(duplicate(list2) ) }       Output :   (1,2) (2,3) (3,4) (4,5) (5,6) (6,7) (7,8) (8,7)… Read More Scala : Remove consecutive duplicates from List