In `clojure.core.reducers`, `map`
<https://github.com/clojure/clojure/blob/clojure-1.8.0/src/clj/clojure/core/reducers.clj#L161-L169>
is implemented as:
(defcurried map
"Applies f to every value in the reduction of coll. Foldable."
{:added "1.5"}
[f coll]
(folder coll
(fn [f1]
(rfn [f1 k]
([ret k v]
(f1 ret (f k v)))))))
I don't understand the purpose of `rfn`, and there are others confused
about it as well <http://disq.us/p/8xfcyj>.
>From what I can see, `rfn` takes a reducing function `f1` and returns a
reducing function with 3 arities. For example, macroexpanding
(rfn [f1 k]
([ret k v]
(f1 ret (f k v))))
gives
(fn
([] (f1))
([ret v] (f1 ret (f v)))
([ret k v] (f1 ret (f k v))))
When is the 3-arity form used? An example would be helpful.
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