clojure.core.reducers/mapcat

functionsince v0.0-1236 clojure.core.reducers/mapcatEdit
(mapcat f)
(mapcat f coll)
Source docstring:
Applies f to every value in the reduction of coll, concatenating the result
  colls of (f val). Foldable.
Source code @ clojurescript:src/main/cljs/clojure/core/reducers.cljs
(defcurried mapcat
  {}
  [f coll]
  (folder coll
   (fn [f1]
     (rfn [f1 k]
          ([ret k v]
             (reduce f1 ret (f k v)))))))