tail-recursion

tail-recursion.scala

def sum(args:Int *): Int = {
 @tailrec
 def tailRecursionSum(argSeq: Seq[Int],result: Int): Int = {
   if (argSeq == Nil)    result
   else
     tailRecursionSum(argSeq.tail, result + argSeq.head)
 }
 tailRecursionSum(args,0)
}

sum(1,2,3,5,6,7,8,9)



def sumCase(args:Int *):Int = {
 @tailrec
 def helper(argsSeq:Seq[Int],result:Int):Int = argsSeq match {
     case Nil => result
     case ::(head, tl) => helper(tl,result+head)
   }
  helper(args,0)
}