Clojure Core

Namespaces

clojure
- core
  - protocols
- data
- inspector
- java
  - browse
  - browse-ui
  - io
  - javadoc
  - shell
- main
- pprint
- reflect
- repl
- set
- stacktrace
- string
- template
- test
  - junit
  - tap
- walk
- xml
- zip

doc source examples comments

1.3.0

constantly

clojure.core

(constantly x)

Returns a function that takes any number of arguments and returns x.

© Rich Hickey. All rights reserved. Eclipse Public License 1.0

3 Examples top

link | changes
```
user=> (def boring (constantly 10))
#'user/boring

user=> (boring 1 2 3)
10
user=> (boring)
10
user=> (boring "Is anybody home?")
10
```
user=> (def boring (constantly 10)) #'user/boring user=> (boring 1 2 3) 10 user=> (boring) 10 user=> (boring "Is anybody home?") 10
link | changes
```
;; A really goofy way to find the size of a collection
user=> (reduce + (map (constantly 1) [:a :b :c]))
3
```
;; A really goofy way to find the size of a collection user=> (reduce + (map (constantly 1) [:a :b :c])) 3
link | changes
```
;; constantly returns a function which always returns the same value
(map (constantly 9) [1 2 3])
user=> (9 9 9)

(map (constantly (rand-int 100)) [:a :b :c])
user=> (43 43 43)
```
;; constantly returns a function which always returns the same value (map (constantly 9) [1 2 3]) user=> (9 9 9) (map (constantly (rand-int 100)) [:a :b :c]) user=> (43 43 43)

Log in to add / edit an example.

See Also top

0
clojure.core/repeatedly
Takes a function of no args, presumably with side effects, and retu

Log in to add a see also.

Source clojure/core.clj:1344 top

(defn constantly
  "Returns a function that takes any number of arguments and returns x."
  {:added "1.0"
   :static true}
  [x] (fn [& args] x))

© Rich Hickey. All rights reserved. Eclipse Public License 1.0

Vars in clojure.core/constantly:

Used in 0 other vars

Comments top

No comments for constantly. Log in to add a comment.