Best way to turn a Lists of Eithers into an Either of Lists?

Question

I have some code like the below, where I have a list of Eithers, and I want to turn it into an Either of Lists ... in particular (in this case), if there are any Lefts in th

Answer 1

val list = List(Left("x"),Right(2), Right(4))
val strings = for (Left(x) <- list) yield(x)
val result = if (strings.isEmpty) Right(for (Right(x) <- list) yield(x)) 
             else Left(strings)