Filter nil values from Clojure map?

Question

What is the best way to filter nil values from a Clojure map {}?

{ :a :x :b nil :c :z }
;;=>  { :a :x, :c :z }

Answer 1

(into {} (keep (fn [e] (if (val e) e)) {:a :x :b nil :c :z}))
;;=> {:a :x, :c :z}

or a little shorter:

(into {} (keep #(if (val %) %) {:a :x :b nil :c :z}))

In fact, your filter suggestion is much better and shorter, so I would just use that:

(into {} (filter val {:a :x :b nil :c :z}))