traversy.clj

;; cf. https://github.com/ctford/traversy
user> (require '[traversy.lens :as lens])
nil
user> (def data {:a [{:aa 1 :bb 2}
                     {:cc 3}]
                 :b [{:dd 4}]})
#'user/data
user> (-> data
          (lens/update (lens/*> lens/all-values lens/each lens/all-values)
                       #(if (even? %) (inc %) %)))
{:a [{:aa 1, :bb 3} {:cc 3}], :b [{:dd 5}]}
user>