For mapping across maps I often find the following utility helpful:
(defn map-map "Like map, but expects f to produce pairs that are
combined to produce a map output."
[f & maps] (reduce #(conj %1 %2) {} (apply map f maps)))
1:1 user=> (map-map (fn [[k v]] [k (str v " Mark")]) {:greet
"hello" :farewell "goodbye"})
{:farewell "goodbye Mark", :greet "hello Mark"}
-Jason
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