Sum_odd_indexes_in_a_list

0_sum_odd_indexes_in_a_list.ex

# I miss interpreted the function, but the outcome was cool
defmodule ListUtil do
  def su(list) do
    sum(list, 0)
  end
  
  def sum([head | tail], acc) do
    sum(tail, head + acc)
  end
  
  def sum([], acc) do
    acc
  end
end

defmodule Solution do
  IO.read(:all)
  |> String.split
  |> Enum.map(&String.to_integer/1)
  |> (&(Enum.drop_every([0 | &1], 2))).()
  |> ListUtil.su
  |> IO.inspect
end

1_solution_sum_odd_elements_list.ex

defmodule ListUtil do
  def su(list) do
    sum(list, 0)
  end
  
  def sum([head | tail], acc) do
    sum(tail, head + acc)
  end
  
  def sum([], acc) do
    acc
  end
end

defmodule Solution do
  IO.read(:all)
  |> String.split
  |> Enum.map(&String.to_integer/1)
  |> Enum.filter(&(rem(&1,2) != 0))
  |> ListUtil.su
  |> IO.inspect
end