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

Probably not the best solution, but here's one that uses list comprehension:

(into {} 
  (for [[k v] {:a 1 :b nil :c :z} :when (not (nil? v))]
    [k v]))