On 12/31/2012 04:52 AM, clojure@googlegroups.com wrote:
2) Is there a good way of doing this with nested maps? An example:
{ :user { :first "John" :last "Doe" :dob { :month 12 :day 30 :year 2012
:garbage "asdf" } } }
I would want to make sure :dob only contains keys :month, :day, :year.
Hi there,
Disclaimer - I'm very much a beginner with functional programming, Lisp
and Clojure. If I understand what you want, I was facing a similar
situation and came up with a working solution (I think). I'm pretty sure
this is a naïve solution but it kept me be going so far. I'd be happy to
hear about other solutions myself.
I did it by walking the data structure using postwalk.
(require '[clojure.walk :as w])
(def data {:user {:first "John" :last "Doe" :dob {:month 12 :day 30
:year 2012 :garbage "asdf" }}})
(w/postwalk #(if (vector? %) (when (or (= :user (first %)) (= :first
(first %)) (= :last (first %)) (= :dob (first %)) (= :year (first %)) (=
:month (first %)) (= :day (first %)) ) %) %) data)
Or in your case, since you have less keys/values you want to remove you
could do.
(w/postwalk #(if (vector? %) (when-not (= :garbage (first %)) %) %) data)
Unfortunately, I have to hard-wire the keys at the moment. Hope this
will give you something to work with if you have not got anything yet.
--
GH<www.ghachey.info>
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