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doc source examples comments

1.3.0

frequencies

clojure.core

(frequencies coll)

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

1 Example top

link | changes
```
user=> (frequencies ['a 'b 'a 'a])
{a 3, b 1}
```
user=> (frequencies ['a 'b 'a 'a]) {a 3, b 1}

Source clojure/core.clj:6255 top

(defn frequencies
  "Returns a map from distinct items in coll to the number of times
  they appear."
  {:added "1.2"
   :static true}
  [coll]
  (persistent!
   (reduce (fn [counts x]
             (assoc! counts x (inc (get counts x 0))))
           (transient {}) coll)))

Vars in clojure.core/frequencies:

Used in 0 other vars

Comments top

1 comment(s) for frequencies.

lispro06

link

(fn [coll]
   (let [gp (group-by identity coll)] 
      (zipmap (keys gp) (map #(count (second %)) gp))))

(fn [coll]
   (let [gp (group-by identity coll)] 
      (zipmap (keys gp) (map #(count (second %)) gp))))

ClojureDocs(beta)

Clojure Core

Namespaces

frequencies

clojure.core

1 Example top

See Also top

Source clojure/core.clj:6255 top

Comments top

1 comment(s) for frequencies.