I find this to be useful: cljs.user> (nil? (.-key (js-obj))) true
I like not having to use undefined? for this On Tue, Jan 15, 2013 at 1:08 AM, Frank Siebenlist < [email protected]> wrote: > ClojureScript:cljs.user> (def a nil) > nil > ClojureScript:cljs.user> (def b) > > ClojureScript:cljs.user> (= a b) > true > -------- > user=> (def a nil) > #'user/a > user=> (def b) > #'user/b > user=> (= a b) > false > -------- > > I didn't realize that the above is dark cave material ;-) > > Could you elaborate a little on the desirable aspect? > (I'm not arguing - only trying to understand as I have just been bitten by > this behavior) > > Thanks, FrankS. > > > > > On Jan 14, 2013, at 9:25 PM, David Nolen <[email protected]> wrote: > > > This behavior is desirable. Unless you are in some dark cave of interop > you shouldn't care. > > > > On Tuesday, January 15, 2013, Frank Siebenlist wrote: > > ClojureScript:cljs.user> (def a nil) > > nil > > ClojureScript:cljs.user> (def b) > > > > ClojureScript:cljs.user> (undefined? a) > > false > > ClojureScript:cljs.user> (undefined? b) > > true > > ClojureScript:cljs.user> (nil? a) > > true > > ClojureScript:cljs.user> (nil? b) > > true > > ClojureScript:cljs.user> (type a) > > nil > > ClojureScript:cljs.user> (type b) > > nil > > ClojureScript:cljs.user> (goog.typeOf a) > > "null" > > ClojureScript:cljs.user> (goog.typeOf b) > > "undefined" > > ClojureScript:cljs.user> (= a b) > > true > > > > > > That doesn't feel right… does it? > > > > Definitely different from clojure… although it's difficult to compare > without vars in cljs. > > > > -FrankS. > > > > > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to [email protected] > > Note that posts from new members are moderated - please be patient with > your first post. > > To unsubscribe from this group, send email to > > [email protected] > > 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 post to this group, send email to [email protected] > > Note that posts from new members are moderated - please be patient with > your first post. > > To unsubscribe from this group, send email to > > [email protected] > > 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 post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > [email protected] > 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 post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en
