Suppose there is a web service return sum of two Int value.

In Python:

def addInt(input):
    if "a" in input and "b" in input:
        a = input["a"]
        b = input["b"]
        try:
            int(a)
            try:
                int(b)
                return a+b
            except:
                print b + " is not int"
        except:
            print a + " is not int"
    else:
        print "a or b not in input parameters"

In Scala:

def addInt(requst:String):Option[Int]={
  val inputParas = Json.parse(requst)
  val a = (inputParas   \ "a").asOpt[Int]
  val b = (inputParas \ "b").asOpt[Int]
  (a,b) match {
    case (a1:Some[Int],b1:Some[Int])=>Some(a1.get +b1.get)
    case _=>None
  }
}

In Scala, using pattern match which will only handles the right path of various input types. So we could more focus on the business which matters.