looking for a 'stateful collector', for merging a sequence of values with a value within a nested structure

something like this:

(use 'com.rpl.specter)

(def o {:a {:x 1}
        :b {:x 1}
        :c {:x 1}})

(def i (range 1 10))

(defcollector putseqval
  [a]
  (collect-val 
   [this structure]
   (let [v (first @a)]
     (swap! a rest)
     v)))

(transform
 [MAP-VALS MAP-VALS (putseqval (atom i))] 
 +
 o);; => {:a {:x 2}, :b {:x 3}, :c {:x 4}}

anybody have any better ideas? 🙂

@tcoupland use subselect

(setval (subselect MAP-VALS MAP-VALS) [2 3 4] o)

can i work that into the transform?

@tcoupland what do you mean?

i want to execute a function (+) on the value in the datastructure (o) and values from the sequence (i)

transform on the subselect will be on the sequence of values

so you can combine the two sequences easily

(transform (subselect MAP-VALS MAP-VALS) (fn [s] (map + s [2 3 4])) o)

clearly i do not grok subselect 🙂

thank you nathan 🙇

i recommend toying around with the size of transformed sequence to fully understand its behavior

do collect and subselect play nicely together?

getting an arity exception in terminal*

for my function i also need the map keys, trying to collect them on the way

(transform [(subselect MAP-VALS (collect FIRST FIRST) MAP-VALS)]
           (fn [fnd] (prn (map (fn [[k v] r] (str k v r)) fnd  i))) 
           o)

Wrong number of args (2) passed to:
   specter/fn--38572/fn/reify--38574/fn--38579

                  AFn.java:  429  clojure.lang.AFn/throwArity
                  AFn.java:   36  clojure.lang.AFn/invoke
                  AFn.java:  156  clojure.lang.AFn/applyToHelper
                  AFn.java:  144  clojure.lang.AFn/applyTo
                  core.clj:  657  clojure.core/apply
                  core.clj:  652  clojure.core/apply
                 impl.cljc:  406  com.rpl.specter.impl$terminal_STAR_/invokeStatic
                 impl.cljc:  403  com.rpl.specter.impl$terminal_STAR_/invoke
                 impl.cljc:  413  com.rpl.specter.impl$compiled_transform_STAR_$fn__36780/invoke
              specter.cljc:  673  com.rpl.specter$reify__38443$next_fn__38449/invoke

the prn in the transform function get's fired and looks right, but then the exception happens

hm, works in a select, but not in the transform

@tcoupland don't use value collection in subselect

i'll put a note about that in its documentation