ff.ex

def greeter() do
    fn
      :droid -> IO.puts "Yikes, a droid"
      "Han Solo" -> :pilot
      %{:name => name, :droid => true} -> name <> "-NG"
      {droid, human, stormtrooper} -> IO.puts "#{droid}'s rule!"
      any -> :ok
   end
end