normal_flow.ex

defmodule OtpConceptsProcesses do

  def start_link() do
    spawn_link(__MODULE__, :loop, [%{}])
  end

  def loop(state) do
    receive do
      {:add, value} ->
        new_state = Map.put(state, :add, value)
        loop(new_state)
      {:remove, value} ->
        new_state = Map.put(state, :remove, value)
        loop(new_state)
      loop(state)
    end
  end
end