empty.clj

empty.clj

;; I forget about this function too often, so now it's a gist!

(empty '(1 2 3))          ; <= ()
(type *1)                 ; <= clojure.lang.PersistentList$EmptyList

(empty (range 1 3))       ; <= ()
(type *1)                 ; <= clojure.lang.PersistentList$EmptyList

(empty [1 2 3])           ; <= []
(type *1)                 ; <= clojure.lang.PersistentVector

(empty {:abc 123})        ; <= {}
(type *1)                 ; <= clojure.lang.PersistentArrayMap

(empty (sorted-map :a 1)) ; <= {}
(type *1)                 ; <= clojure.lang.PersistentTreeMap