if (count <= -cardCount || count >= cardCount) {
  return 0;
}

if (x < 0 && x < -factor && x + cardWidth >= 0) {
  return --count;
}

if (x < 0 && x < -factor) {
  return processXTraveledAndReturnCount((x += cardWidth), --count);
}

if (x < 0) {
  return count;
}

if (x > 0 && x > factor && x - cardWidth <= 0) {
  return ++count;
}

if (x > 0 && x > factor) {
  return processXTraveledAndReturnCount((x -= cardWidth), ++count);
}

if (x > 0) {
  return count;
}

return 0;