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code.exs

defmodule MyRecursion do

  def sum(list, fun) do
    do_sum(list, fun, 0)
  end
  
  defp do_sum([], _fun, acc) do
    IO.puts acc
  end
  
  defp do_sum([h|t], fun, acc) do
    operation = fun.(h)
    result = operation + acc
    do_sum(t, fun, result)
  end
  
end

list = [1,2,3,4,5,6,7,8,9,10]
double = fn(x) -> x * 2 end

MyRecursion.sum(list, double)