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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