reduce-kv in core https://clojuredocs.org/clojure.core/reduce-kv

specter is also very good at this kind of thing if you want to go the library route

concretely

cljs.user=> (reduce-kv (fn [m k v] (assoc m k (clojure.string/upper-case v))) {} {:a "foo"})
{:a "FOO"}

for really marginal values of “better”

Specter would look like this:

(transform MAP-VALS s/upper-case parsed)

Ah, I should have been clearer. No 3rd party deps 🙂 Just core language constructs 🙂

But reduced-kv does brilliantly, thanks bfabry!

(reduce-kv (fn [x y z] (assoc x y (clojure.string/upper-case z))) {} parsed)

There's been some discussion of possibly adding map-keys and/or map-vals for this sort of thing, in Clojure 1.11...

(map-vals str/upper-case parsed)

https://gist.github.com/seancorfield/6e8dd10799e9cc7527da5510c739e52f contains the definitions of them.