sort_vs_sort_by.exs

defmodule Card, do: defstruct([:rank, :suit])

defmodule Sort.Fast do
  def sort(enumerable), do: Enum.sort(enumerable)
end

defmodule Sort.Medium do
  def sort(enumerable), do: Enum.sort(enumerable, &(&1.rank <= &2.rank))
end

defmodule Sort.Slow do
  def sort(enumerable), do: Enum.sort_by(enumerable, & &1.rank)
end

defmodule Sort.Benchmark do
  def benchmark do
    Benchee.run(
      %{
        "sort/1" => fn -> bench(Sort.Fast) end,
        "sort/2" => fn -> bench(Sort.Medium) end,
        "sort_by/2" => fn -> bench(Sort.Slow) end
      },
      time: 10,
      print: [fast_warning: false]
    )
  end

  defp bench(module) do
    cards =
      Enum.map(1..100, fn _ ->
        %Card{rank: Enum.random(0..100), suit: Enum.random(~w[red green blue]a)}
      end)

    module.sort(cards)
  end
end

Sort.Benchmark.benchmark()