Stack Implementation Using Genserver

stack.ex

# stack.ex

defmodule Stack do
  use GenServer

  # server callbacks
  def init(args), do: {:ok, args}

  #used to handle synchronous requests
  def handle_call(:get, _from, state) do
    {:reply, state, state}
  end

  #used to handle asynchronous requests
  def handle_cast(:pop, state) do
    {_popelement, new_state} = List.pop_at(state, -1)
    {:noreply, new_state}
  end

  def handle_cast({:put, new_elem}, state) do
    {:noreply, state ++ [new_elem]}
  end

end