src/code/2/my_map.exs


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defmodule MyMap do
  def map([], _), do: []
  def map([h|t], f) do
    [f.(h)] ++ map(t, f)
  end
end

[1, 2, 3, 4, 5] |> MyMap.map(fn(x) -> x * 2 end) |> IO.inspect