TaxiCabGeometryClass.js

class Position {
  constructor(x, y) {
  this.x = x;
  this.y = y;
  }
  move(distance, vector) {
      const [dx, dy] = vector.getDirection();
      this.x += dx * distance;
      this.y += dy * distance;
  }
}

class Vector {
  directions= [
  [0, 1], // north
  [1, 0], // east
  [0, -1], // south
  [-1, 0] // west
  ];
  constructor(dirIndex) {
      this.dirIndex = dirIndex;
  }

  getDirection() {
      return this.directions[this.dirIndex];
  }

  turnLeft(position) {
      if (this.dirIndex === 0 && position.x === 0) {
        this.dirIndex = 0;
      } else {
        this.dirIndex = (this.dirIndex + this.directions.length - 1) % this.directions.length;
      }
  }

  turnRight(position) {
    if (this.dirIndex === 1 && position.y === 0) {
      this.dirIndex = 1;
    } else {
      this.dirIndex = (this.dirIndex + 1) % this.directions.length;
    }
  }
}

const blocksAway = function(directions) {
  let position = new Position(0, 0);
  let vector = new Vector(0); 
  for (let i = 0; i < directions.length; i += 2) {
      const turnDirection = directions[i];
      const distance = directions[i + 1];

      if (turnDirection === "left") {
          vector.turnLeft(position);
      } else {
          vector.turnRight(position);
      }
      position.move(distance,vector);
  }

  return { east: position.x, north: position.y };
};

console.log(blocksAway(["right", 2, "left", 3, "left", 1]));
console.log(blocksAway(["left", 1, "right", 1, "left", 1, "right", 1, "left", 1, "right", 1]));
console.log(blocksAway(["left", 3, "right", 1, "right", 3, "right", 1]));