> Explain me this, please: > > user=> (def x (cons 'a nil)) > #'user/x > user=> x > (a) > user=> (contains? x 'a) > false > user=>
contains? checks whether the collection contains the *key*, not the value. So for example the list [:a :b] contains keys 0 and 1, but not 2 or :a: user=> (contains? [:a :b] 0) true user=> (contains? [:a :b] 1) true user=> (contains? [:a :b] 2) false user=> (contains? [:a :b] :a) false That said, it was not obvious from (doc contains?) to me what the semantics were for operating on lists. Checking PersistentList, it seems contains() always returns false - which makes sense if you consider that lists are not functions of indexes (while vectors and java arrays are). -- / Peter Schuller -- 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
