Hey everyone! I've got a nested map (It's a deserialization of a flat file JSON "database" for a budgeting app I'm extending) that looks similar to this (stripped down somewhat):

{:categories [{:name "Monthly bills"
               :subcategories [{:name "Electric"}
                               {:name "Cable" :inactive true}
                               {:name "Mortgage"}
                               {:name "Natural Gas"}]}
              {:name "Food"
               :subcategories [{:name "Eating Out"}
                               {:name "Groceries"}]}
              {:name "Stuff"
               :inactive true
               :subcategories [{:name "Things" :inactive true}
                               {:name "Whatever"}]}]
 :accounts [{:name "Checking"
             :balance 100}
            {:name "Old account"
             :balance 0
             :inactive true}
            {:name "Savings"
             :balance 500}]}

{:categories [{:name "Monthly bills"
               :subcategories [{:name "Electric"}
                               {:name "Mortgage"}
                               {:name "Natural Gas"}]}
              {:name "Food"
               :subcategories [{:name "Eating Out"}
                               {:name "Groceries"}]}]
 :accounts [{:name "Checking"
             :balance 100}
            {:name "Savings"
             :balance 500}]}

@ksmithbaylor it would be something like:

(def NODES
  (recursive-path [] p
    (continue-then-stay
      (must :subcategories) ALL p
      )))

(setval [(multi-path :categories :accounts)
         ALL
         NODES
         (pred :inactive)]
  NONE
  data)

This is doing almost what I want: (setval [(walker #(and (map? %) (:inactive %)))] nil data)

but now I need to recursively remove the nils

I'd like to keep it generic so I don't need to know/care what keys are in each level

it's generally better to be more precise about the structure of your data

walker doesn't perform well and has some pitfalls

you can just replace nil with NONE there to get the maps removed

actually nevermind, walker doesn't implement NONE removal