alt Hacker NewsI am a fan of Christophe Grand's xforms library -- https://github.com/cgrand/xforms -- I find the transducer nexus function, by-key, to be particularly useful for eliminating clojure.core destructuring dances when one needs group-by with post-processing.
A not too contrived example: (require '[net.cgrand.xforms :as x]) (into {} (x/by-key :name :size (comp (x/reduce +) (map str))) example-mapseq)