What about the call to .equals? On Tuesday, February 19, 2013 12:20:28 PM UTC-5, Marko Topolnik wrote: > > The difference between String[] and Object[] is that a member of the > former doesn't need a checked cast to String, but the latter does need one. > In the code under consideration, however, nothing specific to String is > used, so even in the Java code you can freely replace String[] with > Object[] and everything still works. > > If, on the other hand, you needed to invoke say *substring*, you'd see a > small penalty due to the checked cast operation. > > On Tuesday, February 19, 2013 5:52:31 PM UTC+1, Andy Fingerhut wrote: >> >> ^objects is a Clojure synonym for ^"[Ljava.lang.Object;". Note that >> there are such synonyms for only a few Java types, not everything, e.g. >> there is no ^strings. >> >> What you are hinting is that a1 and a2 are Java arrays of objects. I >> think this might speed up (aget a1 i) expressions, since it is known that >> a1 is an array of objects, but I'm not sure about that. I believe "under >> the hood" in the JVM all arrays of Objects are treated the same, regardless >> of whether those Objects are String, Integer, java.awt.Color, etc. >> >> Andy >> >> On Feb 19, 2013, at 8:46 AM, Geo wrote: >> >> One thing I don't get is that switching the type hints from >> >> [#^"[Ljava.lang.String;" a1 #^"[Ljava.lang.String;" a2] >> >> to [^objects a1 ^objects a2] didn't seem to have any negative impact on >> performance. Can anyone explain why hinting ^objects is just as good as >> specifying that it's an array of Strings? What are you hinting with >> ^objects that Clojure doesn't already know? >> >>
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