clojure.core.reducers/filter

function

since v0.0-1236

(filter pred)

(filter pred coll)

Source docstring:

Retains values in the reduction of coll for which (pred val)
  returns logical true. Foldable.

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

(defcurried filter
  {}
  [pred coll]
  (folder coll
   (fn [f1]
     (rfn [f1 k]
          ([ret k v]
             (if (pred k v)
               (f1 ret k v)
               ret))))))