Map implementations both with TCO and without

my_map.ex

defmodule MyMap do

  def map_tco(list, function) do
    Enum.reverse _map_tco([], list, function)
  end

  defp _map_tco(acc, [head | tail], function) do
    _map_tco([function.(head) | acc], tail, function)
  end
  defp _map_tco(acc, [], _function) do
    acc
  end
  
  def map_tco_arg_order(list, function) do
    Enum.reverse do_map_tco_arg_order(list, function, [])
  end

  defp do_map_tco_arg_order([], _function, acc) do
    acc
  end
  defp do_map_tco_arg_order([head | tail], function, acc) do
    do_map_tco_arg_order(tail, function, [function.(head) | acc])
  end

  def map_tco_concat(acc \\ [], list, function)
  def map_tco_concat(acc, [head | tail], function) do
    map_tco_concat(acc ++ [function.(head)], tail, function)
  end
  def map_tco_concat(acc, [], _function) do
    acc
  end

  def map_body([], _func), do: []
  def map_body([head | tail], func) do
    [func.(head) | map_body(tail, func)]
  end

  def map_tco_no_reverse(list, function) do
    _map_tco([], list, function)
  end
end