(set coll)
Returns a set of the distinct elements of coll.
;; returns distinct elements
user=> (set '(1 1 2 3 2 4 5 5))
#{1 2 3 4 5}
;; returns distinct elements (different nomenclature)
user=> (set [1 1 2 3 2 4 5 5])
#{1 2 3 4 5}
user=> (set [1 2 3 4 5])
#{1 2 3 4 5}
user=> (set "abcd")
#{\\a \\b \\c \\d}
user=> (set '("a" "b" "c" "d"))
#{"a" "b" "c" "d"}
user=> (set {:one 1 :two 2 :three 3})
#{[:two 2] [:three 3] [:one 1]}
user=> (set nil)
#{}
(set [1 2 3 2 1 2 3])
-> #{1 2 3}
#{:a :b :c :d}
-> #{:d :a :b :c}
(hash-set :a :b :c :d)
-> #{:d :a :b :c}
(sorted-set :a :b :c :d)
-> #{:a :b :c :d}
;------------------------------------------------
(def s #{:a :b :c :d})
(conj s :e)
-> #{:d :a :b :e :c}
(count s)
-> 4
(seq s)
-> (:d :a :b :c)
(= (conj s :e) #{:a :b :c :d :e})
-> true
(s :b)
-> :b
(s :k)
-> nil