I’ve done selective receive with after 0 a couple of times to batch messages. But you can also de-duplicate. e.g.

defmodule Dedup do
  def example_process() do
    Process.sleep(100)
    receive do
      message ->
        dedup(message)
        dosomething(message)
    end

    example_process()
  end

  def dedup(message) do
    receive do
      ^message ->
        dedup(message)
    after
      0 -> :ok
    end
  end

  defp dosomething(message) do
    IO.puts("Got #{inspect(message)}")
  end
end

You probably only need the dedup() method. The rest is just to run the example. Every number will be printed only once even though there are a total of 100 messages sent.

iex(1)> pid = spawn_link &Dedup.process/0
#PID<0.383.0>
iex(2)> for i <- 1..100, do: send(pid, div(i, 10))
[0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2,
 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, ...]
Got 0
Got 1   
Got 2   
Got 3   
Got 4   
Got 5   
Got 6   
Got 7   
Got 8   
Got 9   
Got 10  
iex(3)>