Elixir, Fake OOP with Agents

oop_experiment.ex

defmodule Person do
  use Agent

  def new(name) do
    {:ok, pid} = Agent.start_link(fn -> %{name: name} end)

    %{
      greet: fn -> greet(pid) end,
      get_name: fn -> get_name(pid) end,
      set_name: fn new_name -> set_name(pid, new_name) end
    }
  end

  defp get_name(pid), do:
    Agent.get(pid, & &1.name)

  defp set_name(pid, new_name), do:
    Agent.update(pid, &%{&1 | name: new_name})

  defp greet(pid), do:
    "hello i am #{get_name(pid)}"

end

person = Person.new("marcell")
person.greet.() |> IO.puts()
# Output: "hello i am marcell"
person.set_name.("amanda")
person.greet.() |> IO.puts()
# Output: "hello i am amanda"