Help for a simple queue wrapper

Questions & Help Questions
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1

I need to implement a (simple) queue wrapper on the Erlan :queue, as Elixir does not have something similar :frowning_face: and this Erlang implementation of queue is not handy to use.
I warn that I have little experience with Elixir and fp in general, I am coming from the OOP world - classes, objects, this, self, closure etc.
I wrote this:

defmodule Fifo do
  def new do
    :queue.new()
  end

  def in!(x, q) do
   :queue.in(x, q)
  end

  def out!(q) do
    :queue.out(q)
  end
end

Result => disaster!

q = Fifo.new
{, } # As expected

Then:

Fifo.in!(3, q)
{[3], } # As expected as well

Then came the unexpected:

iex(26)> Fifo.in!(2, q)
{[2], } # Whoops! I expected {[2,3]}
iex(27)> Fifo.in!(“r”, q)
{[“r”], } # expected {[“r”,2,3]}

The disaster completes:

iex(28)> q
{, } #:sob::sob::sob: My queue q is empty!!

There’s clearly something wrong with my implementation, I needed some sort of closure; “this” does not exist in Elixir; the state is not recorded, my variable q is lost on the way.
Please… how to do this ? Help!