Discussion on: This simple math hack lets you create an image carousel without any if statements

[Matthijs Wensveen]

If you create a direction enum like so:

const direction = { FORWARD: 1, BACKWARD: -1 },

const handleImageChange = offset => {
  currentImage = (currentImage + imageData.length + offset) % imageData.length;
}

// call with enum value:
handleImageChange(direction.BACKWARD);

And you're golden. Well, except when you call handleImageChange(-7)

Solution: currentImage = (currentImage + imageData.length + (offset % imageData.length)) % imageData.length
😊