Combining 2 Options into 1

Question

Is there a predefined function x in Scala that combine 2 Options so that

Some(a) x None => Some(a)
None x Some(b) => Some(b)
None x None => None
         


        

Answer 1

In the question comments, you mention you can't have Some(a) and Some(b), so what you really have is Option[Either[Int,Int]]. In that case, you can use x.map(_.merge) to get back to Option[Int], eg

scala> val x:Option[Either[Int,Int]] = Some(Left(2))
x: Option[Either[Int,Int]] = Some(Left(2))

scala> x.map(_.merge)
res0: Option[Int] = Some(2)