Clojurians Log v2
Clojure programming
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clojure-norway
leifericf 2026-06-21T05:03:08.176879Z
Morn!
slipset 2026-06-21T07:29:01.662919Z
Mrn
2026-06-21T11:52:45.414819Z
Man
teodorlu 2026-06-21T12:32:03.403969Z
Morrn
teodorlu 2026-06-21T15:10:17.374069Z
Savner disse to i clojure.core:
;; create map {(f x) x} by passing xs and generating keys
(map-by-keynf :id [{:id 1 :name ""}])
;; create map {x (f x)} by passing xs and generating vals
(map-by-valfn (comp read-string slurp) ["deps.edn" "bb.edn"])medley.core/index-by. 2026-06-21T15:36:03.904539Z
update-keys and update-vals?
teodorlu 2026-06-21T20:18:42.459569Z
(-> (->> ["bb.edn" "deps.edn"]
(into {} (map (juxt identity identity))))
(update-vals (comp count slurp)))
;; => {"bb.edn" 231, "deps.edn" 188}
(-> (->> [{:f "bb.edn" :tag :babashka} {:f "deps.edn" :tag :clojure}]
(into {} (map (juxt identity identity))))
(update-keys :f))
;; => {"bb.edn" {:f "bb.edn", :tag :babashka},
;; "deps.edn" {:f "deps.edn", :tag :clojure}}teodorlu 2026-06-21T20:21:31.796359Z
this looks neater to me:
(defn map-by-keyfn [f xs]
(into {} (map (juxt f identity)) xs))
(map-by-keyfn :f [{:f "bb.edn" :tag :babashka} {:f "deps.edn" :tag :clojure}])
;; => {"bb.edn" {:f "bb.edn", :tag :babashka},
;; "deps.edn" {:f "deps.edn", :tag :clojure}}
(defn map-by-valfn [f xs]
(into {} (map (juxt identity f)) xs))
(map-by-valfn (comp count slurp) ["bb.edn" "deps.edn"])
;; => {"bb.edn" 231, "deps.edn" 188}