As mentioned, 'identical?' tests that two objects are physically the same in memory. `=` tests that two things are logically equal.
Specifically, all numbers in Clojure are "boxed" as objects like java.lang.Long and java.lang.Double. For small integers like 4, the JVM will optimize them to make all instances the same object. Hence, (identical? 4 4) ;=> true Larger integers will be instantiated as new objects each time they are used, so, (identical? 128 128) ;=> true Some more examples: ;; Keywords are interned: (identical? :foo :foo) ;=> true ;; Symbols are not: (identical? 'foo 'foo) ;=> false -S -- 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
