1-1 | No Time for a Taxicab

You're airdropped near Easter Bunny Headquarters in a city somewhere. "Near", unfortunately, is as close as you can get - the instructions on the Easter Bunny Recruiting Document the Elves intercepted start here, and nobody had time to work them out further.

The Document indicates that you should start at the given coordinates (where you just landed) and face North. Then, follow the provided sequence: either turn left (L) or right (R) 90 degrees, then walk forward the given number of blocks, ending at a new intersection.

There's no time to follow such ridiculous instructions on foot, though, so you take a moment and work out the destination. Given that you can only walk on the street grid of the city, how far is the shortest path to the destination?

For example:

How many blocks away is Easter Bunny HQ?

Puzzle input:

solved via coordinate system - using JS/jQuery

Destination is at | - that is blocks away.

All the tasks have been provided by adventofcode.com. I only copied the task descriptions over to allow re-capping later, in case the tasks get lost.

My horrible code can be looked at on GitHub