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

data.partition(_.isLeft) match {                            
  case (Nil,  ints) => Right(for(Right(i) <- ints) yield i)        
  case (strings, _) => Left(for(Left(s) <- strings) yield s)
}

For one pass:

data.partition(_.isLeft) match {                            
  case (Nil,  ints) => Right(for(Right(i) <- ints.view) yield i)        
  case (strings, _) => Left(for(Left(s) <- strings.view) yield s)
}