defmodule HtFinfunc do
  @moduledoc """
  HtFinFunc defines methods for working with financial data.
  """

  @doc """
  Calculate the return on equity given net_income and stockholder's equity.

  ## Examples
      iex> HtFinfunc.return_on_equity(100, 200)
      0.5
  """
  def return_on_equity(net_income, equity) when is_list(equity), do:
    net_income / (Enum.sum(equity) / Enum.count(equity))

  def return_on_equity(net_income, equity), do: net_income / equity


end