Hi,
This is trivial question.
Which style do you like?
(def *counts* (ref {}))
(defn dec-or-dissoc! [key]
(dosync
(let [n (@*counts* key)]
(if (< 1 n)
(alter *counts* assoc key (dec n))
(alter *counts* dissoc key)))))
(defn dec-or-dissoc! [key]
(dosync
(alter *counts*
(fn [m]
(let [n (m key)]
(if (< 1 n)
(assoc m key (dec n))
(dissoc m key)))))))
I think former style is normal, but latter is easy to replace ref with
atom.
Thanks.
--
Takahiro Hozumi
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