disj[oin]. Returns a new set of the same (hashed/sorted) type, that
does not contain key(s).
user=> (disj #{1 2 3}) ; disjoin nothing
#{1 2 3}
user=> (disj #{1 2 3} 2) ; disjoin 2
#{1 3}
user=> (disj #{1 2 3} 4) ; disjoin not existed item
#{1 2 3}
user=> (disj #{1 2 3} 1 3) ; disjoin several items at once
#{2}
Source
clojure/core.clj:1177
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(defn disj
"disj[oin]. Returns a new set of the same (hashed/sorted) type, that
does not contain key(s)."
{:added "1.0"}
([set] set)
([^clojure.lang.IPersistentSet set key]
(when set
(. set (disjoin key))))
([set key & ks]
(when set
(let [ret (disj set key)]
(if ks
(recur ret (first ks) (next ks))
ret)))))
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