Re: Does a standard function exist that acts like assoc except it applies fns to vals
Hi, Am 22.11.2009 um 22:32 schrieb samppi: (defn vary [coll keys-and-fns] (let [fn-map (apply arrray-map keys-and-fns) keys-and-vals (mapcat #((val %) (get coll (key %))) fn-map)] (apply assoc-args coll keys-and-vals))) As Jon said: update-in. (- coll (update-in [:x] fn-x) (update-in [:y] fn-y)) Sincerely Meikel smime.p7s Description: S/MIME cryptographic signature
Does a standard function exist that acts like assoc except it applies fns to vals
Does a function that does this: (vary coll :x fn-x, :y fn-y) ; Equivalent to (assoc coll :x (fn-x (:x coll)), :y (fn-y (:y coll))) exist in the core or contrib APIs? I'm surprised that I can't find any. It's a very natural extension of assoc. But if there really isn't any, is the code below the best/most- idiomatic/most-efficient way to implement such a function? (defn vary [coll keys-and-fns] (let [fn-map (apply arrray-map keys-and-fns) keys-and-vals (mapcat #((val %) (get coll (key %))) fn-map)] (apply assoc-args coll keys-and-vals))) -- 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
Re: Does a standard function exist that acts like assoc except it applies fns to vals
On Sun, Nov 22, 2009 at 4:32 PM, samppi rbysam...@gmail.com wrote: Does a function that does this: (vary coll :x fn-x, :y fn-y) ; Equivalent to (assoc coll :x (fn-x (:x coll)), :y (fn-y (:y coll))) exist in the core or contrib APIs? I'm surprised that I can't find any. It's a very natural extension of assoc. There's update-in, which is like what you want but for assoc-in, but oddly no plain update analogously to plain assoc. I'd use update-in. -- 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
Re: Does a standard function exist that acts like assoc except it applies fns to vals
Ah, update-in is exactly what I need. Excellent, thank you. On Nov 22, 2:38 pm, John Harrop jharrop...@gmail.com wrote: On Sun, Nov 22, 2009 at 4:32 PM, samppi rbysam...@gmail.com wrote: Does a function that does this: (vary coll :x fn-x, :y fn-y) ; Equivalent to (assoc coll :x (fn-x (:x coll)), :y (fn-y (:y coll))) exist in the core or contrib APIs? I'm surprised that I can't find any. It's a very natural extension of assoc. There's update-in, which is like what you want but for assoc-in, but oddly no plain update analogously to plain assoc. I'd use update-in. -- 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
