IKVReduce

protocol

since v0.0-1211

implemented for ObjMap PersistentArrayMap PersistentHashMap PersistentTreeMap PersistentVector Subvec

Source docstring:

Protocol for associative types that can reduce themselves
  via a function of key and val. Called by cljs.core/reduce-kv.

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

(defprotocol IKVReduce
  (-kv-reduce [coll f init]
    "Reduces an associative collection and returns the result. f should be
     a function that takes three arguments."))