Mamun <mamuni...@gmail.com> writes: Hi Mamun,
> When I run the following code, I got false for (identical? 128 128). > What is the different between = and identical? = tests for equality (Object.equals() in Java) while identical? test for the object identities being the same (== in Java). 128 is a java.lang.Long, and there's nothing preventing that are multiple instances (that are not identical) with equal value 128. (However, the JVM does some sort of pooling. It seems there's exactly one Long for any long value in the range [-128...127], but you shouldn't rely on that. Even then, you could do => (identical? 0 (Long. 0)) false (although you should use (Long/valueOf 0) instead of creating a new object forcefully). So in general, you mostly want =. If you know you're comparing numbers, then use ==. If you really want to check for the object identity, then use identical?. Bye, Tassilo -- 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
