conj[oin]. Returns a new collection with the xs
'added'. (conj nil item) returns (item). The 'addition' may
happen at different 'places' depending on the concrete type.
user=> (conj [1 2 3] 4)
[1 2 3 4]
user=> (conj '(1 2 3) 4)
(4 1 2 3)
user=> (conj ["a" "b" "c"] "d")
["a" "b" "c" "d"]
user=> (conj [1 2] 3 4)
[1 2 3 4]
user=> (conj [[1 2] [3 4]] [5 6])
[[1 2] [3 4] [5 6]]
;; Maps only take vectors of length exactly 2
user=> (conj {1 2, 3 4} [5 6])
{5 6, 1 2, 3 4}
Source
clojure/core.clj:75
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(def
^{:arglists '([coll x] [coll x & xs])
:doc "conj[oin]. Returns a new collection with the xs
'added'. (conj nil item) returns (item). The 'addition' may
happen at different 'places' depending on the concrete type."
:added "1.0"
:static true}
conj (fn ^:static conj
([coll x] (. clojure.lang.RT (conj coll x)))
([coll x & xs]
(if xs
(recur (conj coll x) (first xs) (next xs))
(conj coll x)))))
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