What is the best way to convert a list of Option[T] to a list of T where the option is not None? E.g. I want to go from this:
scala> val xs = Some(3) :: None :: Some(4) :: Some(5) :: None :: Nil xs: List[Option[Int]] = List(Some(3), None, Some(4), Some(5), None) to this:
List[Int] = List(3, 4, 5) in the most idiomatic way possible.
You can just do xs.flatten The documentation is here
Converts this list of traversable collections into a list formed by the elements of these traversable collections.
Option is a traversable type and it is biased so traversing the data structure will discard any None values
And fyi null and None are very different things. Your title isn't accurate
