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You're viewing version 1.2.0 of conj. The latest stable version of Clojure Core is 1.3.0.

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1.2.0

1.2.0
1.3.0

conj

clojure.core

(conj coll x)
(conj coll x & xs)

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.

3 Examples top

link | changes
```
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}

user=> (conj {:firstname "John" :lastname "Doe"} {:age 25 :nationality "Chinese"})
{:nationality "Chinese", :age 25, :firstname "John", :lastname "Doe"}

;; conj on a set
user=> (conj #{1 3 4} 2)
#{1 2 3 4}
```
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} user=> (conj {:firstname "John" :lastname "Doe"} {:age 25 :nationality "Chinese"}) {:nationality "Chinese", :age 25, :firstname "John", :lastname "Doe"} ;; conj on a set user=> (conj #{1 3 4} 2) #{1 2 3 4}
link | changes
```
;conjoin shows similar behaviour to cons
(conj ["a" "b" "c"] ["a" "b" "c"] )
user=> [a b c [a b c]]
```
;conjoin shows similar behaviour to cons (conj ["a" "b" "c"] ["a" "b" "c"] ) user=> [a b c [a b c]]
link | changes
```
; conj nil with x or xs
user=> (conj nil 3)
(3)
user=> (conj nil 3 4)
(4 3)
```
; conj nil with x or xs user=> (conj nil 3) (3) user=> (conj nil 3 4) (4 3)

Source clojure/core.clj:71 top

(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"}
 conj (fn 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)))))

Vars in clojure.core/conj: first fn next

Used in 60 other vars (expand)

import select-keys butlast re-groups distinct? map into reverse bean group-by juxt merge add-local-javadoc main union join difference index testing content-handler make-map defalias compute-sip rules-set map-values add-local-javadoc conj lazy-walk parse-item-constraints consume-while map-passing-context consume prof group-by group-by testing flatten-map assoc-param $group-by $rollup cumulative-sum bind-rows som-batch-train sample sample-permutations deftarget compilable-namespaces expand-subcontext-forms run-with-story add-restart-if add-cause-restarts add-hook assign-index inspect-object new-sandbox new-sandbox-compiler group-container-args string-ref-content general-panel frame

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Clojure Core

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conj

clojure.core

3 Examples top

See Also top

Source clojure/core.clj:71 top

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