natural_nums.ex

defmodule NaturalNums do

  import Enum
  import List
  
  def print(n) when not is_integer(n), do: {:error, "input must be an integer"}
  def print(n) when n < 1, do: {:error, "integer must be positive"}
  def print(n) do
    1..n
    |> map(&IO.puts/1)
    #For same return value as original
    |> uniq
    |> first
  end
end