How to filter a persistent map in Clojure?

Question

I have a persistent map which I want to filter. Something like this:

(filter #(-> % val (= 1)) {:a 1 :b 1 :c 2})

The above comes out as

Answer 1

And another one:

(let [m {:a 1 :b 2 :c 1}]
  (select-keys m (for [[k v] m :when (= v 1)] k)))