Clojurians Log v2

specific and general question. General question: where does one go to level up in specter? I feel like I've already tapped out on talks/tutorials and I know I'm only scratching the surface. Case in point -- Specific question: given

(def contrived-data {:time 1535940129129
                       :data [{:a [{:start 389
                                    :stop  456}]}
                              {:b [{:start 113
                                    :stop  889}]}]})

(sm/select [:data s/ALL s/MAP-VALS s/ALL :start] contrived-data)

(sm/transform [:data s/ALL s/MAP-VALS s/ALL :start] sort contrived-data)

@goomba what do you want the result of that transform to be?

sorry, should've posted that

as in, :b should come first because its :start value is lower

what if the inner collection has multiple :start values?

use the lowest?

sure 😅

hadn't thought that far ahead with my contrived example

it's the fact that the keys :a and :b "pre-fix" the data makes any sort of normal update-in/`sort-by` completely unusable, at least with any sort of elegance/performance

but I encounter this problem all the time

you can use something like (fn [m] (reduce min (traverse [MAP-VALS ALL :start] m)) for a "keyfn" to sort-by

and then (transform :data #(sort-by keyfn %) data)

beware that sort-by will change that vector to a list

ohhhh mannn that is cooooolllllll 😄

thank you! how did you... well, I guess because you wrote it, I would've thought to use select instead of traverse

always use traverse if all you'll be doing is a reduce over the result

more efficient since no intermediate list is materialized

🙏 fantastic. Thanks again.