I'm reading Clojure Programming book by O'Reilly..
I came over an example of head retention. First example retains reference to d (I presume), so it doesnt get garbage collected: (let [[t d] (split-with #(< % 12) (range 1e8))] [(count d) (count t)]);= #<OutOfMemoryError java.lang.OutOfMemoryError: Java heap space> While second example doesnt retain it, so it goes with no problem: (let [[t d] (split-with #(< % 12) (range 1e8))] [(count t) (count d)]);= [12 99999988] What I don't get here is what exactly is retained in which case and why. If I try to return just [(count d)], like this: (let [[t d] (split-with #(< % 12) (range 1e8))] [(count d)]) - it seems to create same memory problem. Why is that? Further, I recall reading that count in every case realizes/evaluates a sequence. So, i need that clarified. If I try to return (count t) first, how is that faster/more memory efficient then if I dont return it at all? And what & why gets retained in which case? -- -- 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.