set increment using flatMap

Question

I have a mutuable set and assigning the values to it from input

var set = scala.collection.mutable.Set[Int]() set ++= (in.readLine().split(" ").map(_.toInt))

Input:
1 5

Actual Output:
1,5

Required Output:
1,2,3,4,5

If have used flatMap with condition, but got error. How to achieve this with flatMap

Answer 1

I assume you have always a String like '2 5' as Input:

The solution could look like:

def toSeq(value: String): Seq[Int] = {
  value.split(" ")
  .map(_.toInt).toList match {
    case x1::x2::_ => x1 to x2
    case other => Nil// handle Exception
  }
}
println(toSeq("1 5").toList)

Be aware that the input is not validated!