frequencies

function

since v0.0-927

clojure.core/frequencies

(frequencies coll)

Details:

Returns a map from distinct items in coll to the number of times they appear.

(frequencies [:a :a :b]) => {:a 2, :b 1}

See Also:

Source docstring:

Returns a map from distinct items in coll to the number of times
they appear.

Source code @ clojurescript:src/main/cljs/cljs/core.cljs

(defn frequencies
  [coll]
  (persistent!
   (reduce (fn [counts x]
             (assoc! counts x (inc (get counts x 0))))
           (transient {}) coll)))