First.ex

defp apply_events(events) do
  Enum.reduce(events, %{}, fn(event, state) ->
    apply_event(event.name, event.data, state)
  end)
end

Second.ex

defp apply_events(events) do
  Enum.reduce(events, %{}, &apply_event/2)
end

defp apply_event(%Event{name: name, data: data}, state) do
  apply_event(name, data, state)
end