Is there anything for map which operates like update-in and assoc-in, where we can call a function with the value looked up in a nested structure?
What I've come up with: (defn map-in "Returns a lazy sequence consisting of the results of calling map on coll, for each value in the coll, extracting the value using keys ks, finally applying f the that value and args: (apply f item args)" [coll [& ks] f & args] (map (fn [item] (let [value (reduce #(%2 %1) item ks)] (apply f value args))) coll)) Which could then be used like: (def customers [{:name "Alice" :address {:city "Raleigh" :state "NC"}} {:name "Bob" :address {:city "Seattle" :state "WA"}}]) (map-in customers [:address :state] #(-> % clojure.string/lower-case keyword)) => (:nc :wa) Just wondering if I am re-inventing something here. Thanks, Steve -- 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.