Track the Robot (Part 1)

A robot has been given a list of movement instructions. Each instruction is either left, right, up or down, followed by a distance to move. The robot starts at [0, 0]. You want to calculate where the robot will end up and return its final position as a list.

To illustrate, if the robot is given the following instructions:

["right 10", "up 50", "left 30", "down 10"]

It will end up 20 left and 40 up from where it started, so we return [-20, 40].

Examples

track_robot(["right 10", "up 50", "left 30", "down 10"]) ➞ [-20, 40]

track_robot([]) ➞ [0, 0]
// If there are no instructions, the robot doesn't move.

track_robot(["right 100", "right 100", "up 500", "up 10000"]) ➞ [200, 10500]

Notes

• The only instructions given will be left, right, up or down.
• The distance after the instruction is always a positive whole number.