I've been struggling with streams recently too. in-producer <http://docs.racket-lang.org/reference/sequences.html#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._in-producer%29%29> solved my problems.
(define name-gen (in-producer (lambda () (new-name ethnicity sex)))) (define some-names (for/list ([name name-gen] [i (in-range 10)]) name)) On Sun, Dec 20, 2015 at 9:48 PM, mark <[email protected]> wrote: > > Hi, there. I have just started playing with Racket and would like some > help with using streams/generators (I am not particularly versed in > programming in a functional style and am attempting to learn :-)) > > So I have a function called (new-name) that creates a random name, like > "Bob Brown" or "Jill Xi". It looks something like > > (define (new-name ethnicity sex) > ; return a string like "First LAST" based on ethnicity and sex) > > This is all good and dandy and works well. What I would like to do now is > something like > > (define name-gen > (infinite-generator > (yield (new-name ethnicity sex)))) ; won't work... > > (get-some-names (name-gen "anglo" "male") 10) ; not sure about this... > > Which would, from a generated list or stream, return ten names. I can do > this using something like > > (for/list ([i 10]) > (new-name "anglo" "male")) > > but that seems to miss out on the goodness of streams/generators. > > Any help/tips appreciated. > > TIA, .. mark. > > -- > 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 [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
