Syntax:
constantly value => function
Arguments and Values:
value---an object.
function---a function.
Description:
constantly returns a function that accepts any number of arguments, that has no side-effects, and that always returns value.
Examples:
(mapcar (constantly 3) '(a b c d)) => (3 3 3 3) (defmacro with-vars (vars &body forms) `((lambda ,vars ,@forms) ,@(mapcar (constantly nil) vars))) => WITH-VARS (macroexpand '(with-vars (a b) (setq a 3 b (* a a)) (list a b))) => ((LAMBDA (A B) (SETQ A 3 B (* A A)) (LIST A B)) NIL NIL), true
Affected By: None.
Exceptional Situations: None.
See Also:
Notes:
constantly could be defined by:
(defun constantly (object) #'(lambda (&rest arguments) object))The following X3J13 cleanup issue, not part of the specification, applies to this section:
RetroSearch is an open source project built by @garambo | Open a GitHub Issue
Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo
HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4