> Welcome to Racket v5.3.0.14. > > (require lang/htdp-beginner) > > (string-lower-case? "ABC") > #f > > (string-lower-case? "aBC") > #f > > (string-lower-case? "abc") > #t
http://pre.racket-lang.org/docs/html/htdp-langs/beginner.html#(def._htdp-beginner._((lib._lang/htdp-beginner..rkt)._string-upper-case~3f)) On Jul 13, 2012, at 9:02 AM, Rouben Rostamian wrote: > The function `all-lower-case?' defined below takes a string and > returns #f if the string has at least one uppercase alphabetic > character, else returns #t. > > Examples: > (all-lower-case? "asdf12#@") => #t > (all-lower-case? "asDf12#@") => #f > > Here is how I have written it: > > (define (all-lower-case? str) > (not (memq #t > (map (lambda (i) > (if (and (char-alphabetic? i) (char-upper-case? i)) > #t #f)) > (string->list str))))) > > This looks rather clumsy to me. I am converting the string into > a list of characters, then I check the case of each character > and issue the requisite verdict. It seems to me that there > ought to be a neater way. Any suggestions? > > -- > Rouben Rostamian > ____________________ > Racket Users list: > http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
