Returns the final position of a taxicab w.r.t the initial position, given a list of directions.

Taxicab Geometry

/*I don't understand for console.log(blocksAway(["left", 1, "right", 1, "left", 1, "right", 1, "left", 1, "right", 1]));
it's supposed to return east: 3 when it's clearly east: -3 (ie. west: 3). This is all with the assumption that the driver starts at (0,0) facing north */
const blocksAway = function(directions) {
  let finalPosition = [0,0];
  let carFacing = 'N';
  for (let i = 0; i < directions.length ; i += 2){
    if (directions[i] === 'right'){
      switch (carFacing){
        case 'N':
          finalPosition[0] += directions[i+1];
          carFacing = 'E';
          break;
        case 'S':
          finalPosition[0] -= directions[i+1];
          carFacing = 'W';
          break;
        case 'W':
          finalPosition[1] += directions[i+1];
          carFacing = 'N';
          break;
        case 'E':
          finalPosition[1] -= directions[i+1];
          carFacing = 'S';
      }
    }else{
      switch (carFacing){
        case 'N':
          finalPosition[0] -= directions[i+1];
          carFacing = 'W';
          break;
        case 'S':
          finalPosition[0] += directions[i+1];
          carFacing = 'E';
          break;
        case 'W':
          finalPosition[1] -= directions[i+1];
          carFacing = 'S';
          break;
        case 'E':
          finalPosition[1] += directions[i+1];
          carFacing = 'N';
      }
    }
  }
  return {east: finalPosition[0], north: finalPosition[1]};
}