Submarine route command

test.exs

data =
"""
forward 5
down 5
forward 8
up 3
down 8
forward 2
"""

instructions = String.split(data, ~r/[\n]+/, trim: true)

coordinates =
	instructions
	|> Enum.reduce(%{x: 0, y: 0}, fn cmd, acc ->
		case cmd do
			"forward " <> step ->
				step = Integer.parse(step) |> elem(0)
				%{acc | x: acc.x + step}

			"down " <> step ->
				step = Integer.parse(step) |> elem(0)
				%{acc | y: acc.y + step}

			"up " <> step ->
				step = Integer.parse(step) |> elem(0)
				%{acc | y: acc.y - step}
		end
	end)

%{x: x, y: y} = coordinates

IO.inspect(x * y, label: "total")