user=> (empty [1 2 3]) [] user=> (empty (list 1 2 3)) () user=> (map #(empty %) [[\a \b] {1 2} (range 4)]) ([] {} ())
If coll is empty, returns nil, else coll
(defn empty "Returns an empty collection of the same category as coll, or nil" {:added "1.0" :static true} [coll] (when (instance? clojure.lang.IPersistentCollection coll) (.empty ^clojure.lang.IPersistentCollection coll)))
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