Creating stateful module in elixir

user.exs

# Using the erlang mechanism of tuple modules it is possible to create a "stateful module".
# This concept of a stateful module is discussed in "Programming erlang" Second edition.


defmodule User do
  defstruct name: nil, admin: false, internal: "kinda private"

  def new(name, options \\ []) do
    dependencies = struct(%__MODULE__{name: name}, options)
    {__MODULE__, dependencies}
  end

  def name({__MODULE__, my}) do
    my.name
  end

  def admin?({__MODULE__, my}) do
    my.admin
  end
end

me = User.new("Peter")

IO.puts me.name
IO.puts me.admin?

bob = User.new("Bob", admin: true)

IO.puts bob.name
IO.puts bob.admin?
bob.internal

Ew. :/