>Hi Thanks for the super fast response, Still a little confused. If coll is set to nil before >reduce is called, then what is reduce called with?
Remember, the JVM is a stack machine (before the JIT is run). So the code produced is something like this: push coll push nil pop-into coll call-fn reduce Timothy On Tue, Feb 5, 2013 at 9:31 AM, Herwig Hochleitner <hhochleit...@gmail.com>wrote: > 2013/2/5 N8Dawgrr <nathan.r.matth...@gmail.com> > >> Hi Thanks for the super fast response, Still a little confused. If coll >> is set to nil before reduce is called, then what is reduce called with? > > > It's called with the value coll had right before it being set to nil. > > Clojure even has Util.retl, with a dummy arg, to do this even in plain > java, for example: > https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/Compiler.java#L3458 > > Jim: > > > Couldn't the compiler infer that the 2 expressions are identical with > identical arguments and perform the reduce only once? Basically what the > programmer would do in a let statement? Would that be too expensive? > > No the compiler could only do that, if it knew that reduce (and its > reducing fn) has no side effects. Clojure has no mutability analysis. > > -- > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- “One of the main causes of the fall of the Roman Empire was that–lacking zero–they had no way to indicate successful termination of their C programs.” (Robert Firth) -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
