defmodule Panty.Benchmark.Collection do
  alias Panty.Collection

  def ben_collection do
    list = 1..10000 |> Enum.to_list()
    half = 9989..19999 |> Enum.to_list()

    hyphen_way = fn(list, half) -> (list -- (list --half)) end

    Benchee.run(%{
      "use.intersection"  => fn -> Collection.intersection(list, half) end,
      "use.hyphens"       => fn -> hyphen_way.(list, half) end
    })

    long_collection = 1..10000000 |> Enum.to_list()

    Benchee.run(%{
      "use.initial.elixir" => fn -> Panty.Collection.initial(long_collection) end,
      "use.initial.erlang" => fn -> :lists.droplast(long_collection) end
    })
  end
end