So when define-struct introduces functional mutators as planned for a while
now, and this program looks like this:
(cond
[(mouse-in? 248 x 424 570 y 649) (set-world-background blah)]
...
Matthew will be happy?
On Aug 1, 2010, at 6:14 PM, Todd O'Bryan wrote:
> You'd create the new world and set field values using mutators.
>
> So
>
> if (x > 248 && x < 424 && y > 570 && y < 649) {
> SState newState = new SState();
> newState.setBackground(blah);
> newState.setButton(blah2);
> ...
> }
>
> On Sun, Aug 1, 2010 at 5:22 PM, Richard Cleis <rcl...@mac.com> wrote:
>> [snip]
>>
>> I was trying to emphasize that it may be harder to students to keep their
>> code neater compared to some other languages which usually have code that
>> rarely exceed 1 line.
>> Example:
>> Racket using the universe teachpack:
>> (define (s-mouse-engine s x y event)
>> (cond
>> [(and
>> (and (> x 248) (< x 424))
>> (and (> y 570) (< y 649)))
>> (make-S-STATE
>> (get-s-background s) ;;I have made methods here to
>> reduce length, but other wise it would be longer.
>> (make-button
>> (s-mouse-engine-worker1 event "button-img")
>> (get-s-button-x s) ;;I have made methods here to
>> reduce length, but other wise it would be longer.
>> (get-s-button-y s) ;;I have made methods here to
>> reduce length, but other wise it would be longer.
>> (s-mouse-engine-worker1 event "button-initiate")))]
>>
>> How would you write that in another language that rarely exceeds one line?
>> rac
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