While pointing students at teachpacks for HtDP/2e, one of our tutors correctly pointed out that they're not documented using HtDP signatures, but using standard Racket contracts. For instance, in big-bang's docs:
> (to-draw render-expr) > render-expr: (-> WorldState scene?) http://docs.racket-lang.org/teachpack/2htdpuniverse.html?q=posn#%28form._world._%28%28lib._2htdp%2Funiverse..rkt%29._big-bang%29%29 Instead, the beginner language seems to use a mixture, alternating between "class" `number` and predicate `boolean?`: http://docs.racket-lang.org/htdp-langs/beginner.html And in fact, `number` is the style of HtDP/1e, while HtDP/2e uses `Number`. The differences aren't huge, but I'd guess that sometimes they're noticeable or problematic for beginners. 0. Am I mistaking something? 1. Is this intended or are changes planned? 2. How do you deal with this in your courses? Do you teach both signature styles? Will this not confuse students? Cheers, Paolo -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
