CHALLENGE: Reverse Range Generator

You've had a lot of practice building a range generator with a while loop. But let's see if you can rework the function so that it can also generate reversed ranges. If the start parameter is greater than the end parameter, the resulting range should be in reverse order. For example:

makeRange(5, 10); // [5, 6, 7, 8, 9, 10]
makeRange(10, 5); // [10, 9, 8, 7, 6, 5]

This challenge isn't easy. If you've worked on it for a while and can't make progress, it's okay to skip ahead.