Benchee benchmark of csv processing

lazy_csv_bench.exs

lazy_csv_fn = fn ->
	File.stream!("large.csv")
	|> Stream.map(&String.trim(&1))
	|> Stream.map(&String.split(&1, ","))
	|> Stream.filter(fn
	  ["Timestamp" | _] -> false
	  [_, "NaN" | _] -> false
	  [timestamp | _] ->
	    true
	end) |> Enum.find(fn
	  [timestamp | _] ->
	    ts = String.to_integer(timestamp)
	    dt = DateTime.from_unix!(ts)
	    dt.year == 2015
	end)
end

Benchee.run(%{
  "lazy_csv"    => lazy_csv_fn
}, time: 10, memory_time: 2)