How to split a List[Either[A, B]]

Question

I want to split a List[Either[A, B]] in two lists.

Is there a better way ?

def lefts[A, B](eithers : List[Either[A, B]]) : List[A] = eit         


        

Answer 1

A compact, but not CPU-effictive solution:

val lefts = list.flatMap(_.left.toOption)
val rights = list.flatMap(_.right.toOption)