> On Sep 16, 2018, at 10:07 PM, Matthew Butterick <m...@mbtype.com> wrote: > > >> On Sep 16, 2018, at 2:13 PM, Kevin Forchione <lyss...@gmail.com >> <mailto:lyss...@gmail.com>> wrote: >> >> Thanks! That’s just what I wanted. Is there a way in Racket to determine if >> a quoted symbol has an associated procedure? > > > > #lang racket > (require rackunit) > > (define-syntax (bound-to-proc? stx) > (syntax-case stx () > [(_ 'x) > (and (identifier? #'x) (identifier-binding #'x)) > #'(procedure? x)] > [_ #'#f])) > > (define bound-to-proc +) > (define not-bound-to-proc 42) > > (check-true (bound-to-proc? 'bound-to-proc)) > (check-false (bound-to-proc? 'not-bound-to-proc))
Sorry for the typo and thanks for the further explanation. Your original response to my query was more in line with what I’m trying to accomplish, while my second question was more in the realm of curiosity. In a nutshell I’m working with some hash tables whose keys are symbol and whose values may be other keys or values such as identifiers, and I got a bit tired of quoting all my symbols for functions and decided to use some macros when working with the tables. Probably more than curiosity as I can foresee a need to retrieve a value from a table and either apply it, which means somehow getting at the binding. Kevin -- 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.
