Fold is awesome.

fold.scala

val things = Seq(1,2,3,4,5,6).map(Some(_)) ++ Seq(None, None)

for(thing <- things)
yield thing.fold {
  println("Bummer Dude")
} { value =>
  value % 2
  println("whatever man")
  println("""
    See? Long things can happen in the "success" scenario.
    So having the error scenario first means that you're
    both forced to handle the error (you don't have the 
    option not to), and also that your code is structured
    nicely because this order is generally just good style
    and how you'd expect to see something like an if()
    statement structured.
    
    I don't know about you, but I hate it when someone writes:
    
    if some_condition?
      lots
      of
      success
      code
      goes
      here
    else
      handle_the_error_in_a_one_liner_at_the_bottom_here
    end
  """)
  value * 35
}