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 - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+unsubscribe@**googlegroups.com<clojure%2bunsubscr...@googlegroups.com> >> For more options, visit this group at >> http://groups.google.com/**group/clojure?hl=en<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+unsubscribe@**googlegroups.com<clojure%2bunsubscr...@googlegroups.com> >> . >> For more options, visit >> https://groups.google.com/**groups/opt_out<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+unsubscribe@**googlegroups.com<clojure%2bunsubscr...@googlegroups.com> > For more options, visit this group at > http://groups.google.com/**group/clojure?hl=en<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+unsubscribe@**googlegroups.com<clojure%2bunsubscr...@googlegroups.com> > . > For more options, visit > https://groups.google.com/**groups/opt_out<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.
