clojure.core.reducers/append!

functionsince v0.0-1236 clojure.core.reducers/append!Edit
(append! acc x)

Source docstring:
.adds x to acc and returns acc
Source code @ clojurescript:src/main/cljs/clojure/core/reducers.cljs
(defn append!
  [acc x]
  (doto acc (.push x)))