String Eval

controller.ex

def compare(conn, params) do
  first = params["code"]["first_snippet"]
  second = params["code"]["second_snippet"]

  {val, _} = Code.eval_string("Benchee.init(%{time: 3})
    |> Benchee.benchmark('First', fn -> #{first} end)
    |> Benchee.benchmark('Second', fn -> #{second} end)
    |> Benchee.measure
    |> Benchee.statistics
    |> BencheeWeb.Formatter.to_map")

  render conn, "compare.html", vals: val
end