Slow brute force approach, but with processes.

snake_case_multi.ex

# Snake Case multi-process!

defmodule SnakeCase do
  def multi do
    Agent.start_link(fn -> 0 end, name: __MODULE__)
    ranges = Enum.chunk(0..round(:math.pow(2, 20)), 262144)
    tasks = Enum.map ranges, fn range ->
      Task.async(fn -> subrange(range) end)
    end
    for task <- tasks, do: Task.await(task)

    Agent.get(__MODULE__, fn x -> IO.puts "Multi process result is #{x}" end)
  end

  defp subrange(range) do
    count = Enum.count range, fn x -> Integer.to_string(x, 2) |> String.replace("0", "") |> String.length == 10 end
    Agent.update(__MODULE__, fn(n) -> n + count end)
  end
end

IO.inspect :timer.tc fn -> SnakeCase.multi end