clojure.core/disj!

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Type: function Added: Clojure 1.1 Examples: 2 Runnable: 1

([set] [set key] [set key & ks])

disj[oin]. Returns a transient set of the same (hashed/sorted) type, that does not contain key(s).

Examples

by yasuto on 2011-06-10 . May have evaluation errors. ▶

;; Note how we always use the return value of disj! and conj! in these examples ;; for all future modifications, rather than (incorrectly) ignoring the return ;; value and continuing to modify the original transient set. See examples for ;; assoc! and dissoc! for more discussion and examples of this. ;; Also see one example for conj! that contains a detailed example ;; of a wrong result that can occur if you do not use its return value. (def foo (transient #{'pore-pore 'slow 'yukkuri})) #'user/foo (count foo) 3 (def foo (disj! foo 'yukkuri)) #'user/foo foo #<TransientHashSet clojure.lang.PersistentHashSet$TransientHashSet@3bd840d9> (count foo) 2 (def foo (conj! foo 'yukkuri)) #'user/foo foo #<TransientHashSet clojure.lang.PersistentHashSet$TransientHashSet@3bd840d9> (count foo) 3 (def foo (persistent! foo)) #'user/foo foo #{yukkuri slow pore-pore}

by reborg on 2018-08-09 ▶

;; A faster implementation of disj for a large number of keys to disjoin: (defn disj* [s & ks] (persistent! (reduce disj! (transient s) ks))) (let [s (set (range 1000)) xs (range 400 600)] (count (apply disj* s xs))) ;; 800

See also

• clojure.core/assoc! (2)
• clojure.core/dissoc!
• clojure.core/disj (2)
• clojure.core/conj! (2)

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