Why is my Swift loop failing with error “Can't form range with end < start”?

Question

I have a for loop that checks if a number is a factor of a number, then checks if that factor is prime, and then it adds it to an array. Depending on the original number, I wil

Answer 1

If you want to use range where upperBound < lowerBound, you can add reversed() to it.

for eg: for number in (0...highestPossibleNumber).reversed()