While it's useful to learn proper debugging sometime your approach is valid as well. By the looks of it you're using the optimal solution to your problem. I pr

While it's useful to learn proper debugging sometime your approach is valid as well. By the looks of it you're using the optimal solution to your problem. I prefer to code in Common Lisp on the REPL and do the same thing as you most of the time since each iteration step is so fast. (Change a function -> update it in the live running environment -> test ...)