Mix.install([:jason])

"all_walks.json"
|> File.read!()
|> Jason.decode!()
|> Enum.reduce({0, 0}, fn data, {dist_acc, time_acc} ->
  {dist_acc + data["distance"], time_acc + data["elapsed_time"]}
end)
|> then(fn {distance, time} ->
  IO.puts("Total miles: #{distance * 0.000621371}")
  IO.puts("Total minutes: #{time / 60}")
end)