See the doc below. What (contains? [1 2] 1) is testing is whether [1 2] has a value at index 1 (the key value for numerically indexed collections). It does, so it returns true. What you are probably looking for is the Java method .contains of the vector:
(.contains ["a" "b"] "a") ;=> true (.contains [1 2 5] 5) ;=> true user> (doc contains?) ------------------------- clojure.core/contains? ([coll key]) Returns true if key is present in the given collection, otherwise returns false. Note that for numerically indexed collections like vectors and Java arrays, this tests if the numeric key is within the range of indexes. 'contains?' operates constant or logarithmic time; it will not perform a linear search for a value. See also 'some'. On Wed, Aug 24, 2011 at 4:57 PM, Andrew Xue <and...@lumoslabs.com> wrote: > the below seems odd > > user=> (contains? [1 2] 1) > true > user=> (contains? ["a" "b"] "a") > false > > am i missing something? > > -- > 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 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
