clojure.set/index

function

since v0.0-927

clojure.set/index

Edit

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Source docstring:

Returns a map of the distinct values of ks in the xrel mapped to a
set of the maps in xrel with the corresponding values of ks.

(defn index
  [xrel ks]
    (reduce
     (fn [m x]
       (let [ik (select-keys x ks)]
         (assoc m ik (conj (get m ik #{}) x))))
     {} xrel))

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