This is also very easy to implement:
(into {}
(for [[k v] the-map]
[k (f v)]))
e.g.
user=> (into {}
(for [[k v] {:a 3 :b 7}]
[k (inc v)]))
{:a 4, :b 8}
user=>
and to encapsulate as a function:
(defn fmap [f m]
(into {}
(for [[k v] m]
[k (f v)])))
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