On Jul 15, 2011, at 2:56 PM, Stephen Bloch wrote: > I've experimented with a couple of ways to do that. One way is to define (in > my code, not visible to student code) a box named "world-pic", which is > set-box!ed in "move" and "run-byob-world". Another is to use just a plain > variable and "set!", again hidden inside "move" and "run-byob-world". Both > seem to work for my toy examples so far; is there any advantage of one over > the other? What subtle gotchas am I going to run into? Is "a little bit of > mutation" like "a little bit pregnant?"
I don't understand your solution. But if students cannot test their event handling functions in a functional style, then the answer to the last question is YES, you're pregnant. ;; --- If so, the question is what you wish to accomplish with the library. If you're fine with teaching things that look like algebra but are actually imperative, join the club. Everyone else except us is doing it. _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
