title: How can i derive values list of values from list of either using flatmap for fold?
body: <p>im trying to convert a scala list of eithers, as such:</p>
  <pre><code>List(Left(3),Left(4),Left(1),Left(5))
  </code></pre>
  <p>Into a either of a list Either[List[Int],Int] like this?
  Left(3,4,1,5)
  Only using flatmap, map or fold?
  ive been hammering at it for a while now and can simply not make it work</p>