code: function multiply(point, rhs) {
      if (typeof rhs === 'number') {
          return {
              x: point.x * rhs,
              y: point.y * rhs,
          };
      } else {
          return {
              x: point.x * rhs.x,
              y: point.y * rhs.y,
          };
      }
  }
docs: multiply point by point or number
  @param {Point2D} point
  @param {(Point2D | number)} rhs