`->` inserts its first argument into the second position of the next argument, and so on, so (-> [] (conj 1) (conj 2))
Turns into (conj (conj [] 1) 2) `->>` inserts its first argument into the LAST position of the next argument, and so on, so (->> 1 (conj [2]) (conj [3])) Turns into (conj [3] (conj [2] 1)) I guess it is "bottom to top," in a way, but I always thought that was kind of an artifact of the argument (re-)ordering. On Saturday, August 30, 2014 12:19:31 PM UTC-4, g vim wrote: > > On 30/08/2014 17:04, Alexey Kachayev wrote: > > Thread-first macro ->will insert list-of-listsas first argument for map, > > which is definitely not what you expect. Use threading-last ->>instead. > > > > I've never quite understood the distinction other than -> does > everything top to bottom and ->> does the reverse. From what you're > saying the choice also affects which position the argument is inserted? > If so this presents a complication in that threading through several > functions may require the argument to be inserted in different positions? > > gvim > -- 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/d/optout.
