Hi again,
or more like this:
(defn exchange!
[a b & {:keys [f] {f (fn [_ v] v)}}]
(let [av @a bv @b]
(alter a f bv)
(alter b f av)))
(defn exchange-color!
[a b]
(exchange! a b :f #(assoc %1 :color (:color %2))))
(exchange-color! a b)
Sincerely
Meikel
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