As Elixir doesn't have a way to create an anonymous recursive function yet, we have to do a little trick and pass the function to itself when calling it to get recursion

anonymous_recursive1.exs

print = fn f ->
  receive do
    name -> IO.puts(name)
    f.(f)
  end
end

server = spawn(fn -> print.(print) end)

send(server, "Sharno")

anonymous_recursive2.exs

concat = fn message ->
  print = fn f ->
    receive do
      name -> IO.puts(message <> name)
      f.(f)
    end
  end
  print.(print)
end

greet = spawn(fn -> concat.("Hello ") end)

send(greet, "Sharno")