thank you, I'll look into protocols
On Mon, Apr 29, 2013 at 7:54 PM, Gary Trakhman <gary.trakh...@gmail.com>wrote: > You would only need a macro if you want to pass in 'a' and mean #'a. > Syntactic abstraction. Like I said, I'd make the implementation > polymorphic on that value via a protocol so you're not special-casing it > within the function itself. Protocols are open for extension so someone > else could come along and provide an implementation for something you > haven't thought of doing. > > > On Mon, Apr 29, 2013 at 12:44 PM, AtKaaZ <atk...@gmail.com> wrote: > >> oh right, you mean that I should pass the var like (decorate #'a), I >> didn't get that when I first read it. But suppose I'm just passing the >> whatever-that-is (value?) like (decorate a) do I need to use a macro inside >> the decorate function to check if the passed thing is an unbound var? >> >> >> On Mon, Apr 29, 2013 at 7:31 PM, Gary Trakhman >> <gary.trakh...@gmail.com>wrote: >> >>> If you're passing the var itself, I don't see why you'd need a macro. >>> If you want to check the namespace for a var matching an unquoted symbol, >>> you could do that in a macro. >>> >>> >>> On Mon, Apr 29, 2013 at 12:29 PM, AtKaaZ <atk...@gmail.com> wrote: >>> >>>> Seems like a good idea to have the root binding be nil. How would you >>>> make it check for bound inside the function? do we need some kind of macro? >>>> >>>> >>>> On Mon, Apr 29, 2013 at 7:23 PM, Gary Trakhman <gary.trakh...@gmail.com >>>> > wrote: >>>> >>>>> Why not make the root binding nil? If your decorate function is >>>>> supposed to handle all vars, then they have to deal with the unbound case >>>>> as that's part of the contract of vars. >>>>> >>>>> If it's a generic thing, then maybe make a multimethod or protocol for >>>>> it. >>>>> >>>>> >>>>> On Mon, Apr 29, 2013 at 12:17 PM, AtKaaZ <atk...@gmail.com> wrote: >>>>> >>>>>> I'm thinking something like (def ^:dynamic *a*) where it would make >>>>>> more sense that it's unbound at first >>>>>> >>>>>> >>>>>> On Mon, Apr 29, 2013 at 7:00 PM, Jim - FooBar(); < >>>>>> jimpil1...@gmail.com> wrote: >>>>>> >>>>>>> I 've found that whenever I get a var-unbound exception it is almost >>>>>>> always my fault and my fault only...why would you do (def a) anyway? >>>>>>> >>>>>>> Jim >>>>>>> >>>>>>> >>>>>>> >>>>>>> On 29/04/13 16:32, AtKaaZ wrote: >>>>>>> >>>>>>>> How do you guys handle the cases when the var is unbound? I mean >>>>>>>> specifically in the cases where you just test if the var is nil. >>>>>>>> >>>>>>>> => (def a) >>>>>>>> #'clojurewerkz.titanium.graph-**test/a >>>>>>>> >>>>>>>> => a >>>>>>>> #<Unbound Unbound: #'clojurewerkz.titanium.graph-**test/a> >>>>>>>> >>>>>>>> => (nil? a) >>>>>>>> false >>>>>>>> >>>>>>>> => (bound? a) >>>>>>>> ClassCastException clojure.lang.Var$Unbound cannot be cast to >>>>>>>> clojure.lang.Var clojure.core/bound?/fn--4837 (core.clj:4954) >>>>>>>> >>>>>>>> => (bound? #'a) >>>>>>>> false >>>>>>>> >>>>>>>> ok imagine the following sample :)) >>>>>>>> >>>>>>>> => (defn decorate [input] >>>>>>>> (when (not (nil? input)) (str "prefix:" input ":suffix"))) >>>>>>>> #'clojurewerkz.titanium.graph-**test/decorate >>>>>>>> >>>>>>>> => (decorate "1") >>>>>>>> "prefix:1:suffix" >>>>>>>> >>>>>>>> => (decorate a) >>>>>>>> "prefix:Unbound: #'clojurewerkz.titanium.graph-**test/a:suffix" >>>>>>>> >>>>>>>> so... fix? >>>>>>>> but more importantly does anyone need to add checks for >>>>>>>> is-the-var-bound in their code where they checked for nil ? >>>>>>>> >>>>>>>> -- >>>>>>>> -- >>>>>>>> You received this message because you are subscribed to the Google >>>>>>>> Groups "Clojure" group. >>>>>>>> To post to this group, send email to clojure@googlegroups.com >>>>>>>> Note that posts from new members are moderated - 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please be patient with >>>> your first post. >>>> To unsubscribe from this group, send email to >>>> clojure+unsubscr...@googlegroups.com >>>> For more options, visit this group at >>>> http://groups.google.com/group/clojure?hl=en >>>> --- >>>> You received this message because you are subscribed to the Google >>>> Groups "Clojure" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to clojure+unsubscr...@googlegroups.com. >>>> For more options, visit https://groups.google.com/groups/opt_out. >>>> >>>> >>>> >>> >>> -- >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clojure@googlegroups.com >>> Note that posts from new members are moderated - please be patient with >>> your first post. >>> To unsubscribe from this group, send email to >>> clojure+unsubscr...@googlegroups.com >>> For more options, visit this group at >>> http://groups.google.com/group/clojure?hl=en >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to clojure+unsubscr...@googlegroups.com. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >>> >> >> -- >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clojure@googlegroups.com >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscr...@googlegroups.com >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+unsubscr...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > -- > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. 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