Sorting without breaking the original

A common mistake is forgetting that array.sort() changes the array itself and then returns it, so you sort it once and its original order is gone for good.

The fix is to take a copy before sorting, [...products].sort(...), or to use products.toSorted(...) in modern JavaScript.

The compare function returns a number: a negative one means the first item comes before the second, and a positive one means the opposite. For numbers you write (a, b) => a.price - b.price.