On Fri, Jan 29, 2010 at 8:44 AM, Rich Hickey <richhic...@gmail.com> wrote: > On Fri, Jan 22, 2010 at 8:57 AM, Chouser <chou...@gmail.com> wrote: >> On Thu, Jan 21, 2010 at 10:11 PM, Sean Devlin <francoisdev...@gmail.com> >> wrote: >>> Sometimes you don't want assoc-in to create a hash-map. Sometimes you >>> wish it could create a sorted map. >>> >>> Just finished working on something with Alexy Khrabrov & Chouser on >>> IRC, and the three of us are wondering if the result might be >>> generally useful. >>> >>> (defn assoc-in-with >>> "supply a default-map instead of a hash-map" >>> [m default-map [k & ks] v] >>> (if ks >>> (assoc m k (assoc-in-as (get m k default-map) default-map ks v)) >>> (assoc m k v))) >> >> As I mentioned in IRC, this could actually be a 4-argument >> version of 'assoc-in' instead of a new function. Assuming of >> course Rich likes the idea. >> > > Where would the default go? Also, need it be a map, vs anything > associative (e.g. a vector)?
Since update-in could use this pattern as well, I don't think the default should go after the value (or update fn) position. I think where Sean put it is fine -- after the collection, before the vector of keys. I don't see why it needs to be restricted to a map -- all the normal assoc rules apply. --Chouser http://joyofclojure.com/ -- 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
