User Tools

A PCRE internal error occured. This might be caused by a faulty plugin

====== Function CONSTANTLY ====== ====Syntax==== * **constantly** //value// → //function// ====Arguments and Values==== * //value// - an //[[CL:Glossary:object]]//. * //function// - a //[[CL:Glossary:function]]//. ====Description==== **constantly** returns a //[[CL:Glossary:function]]// that accepts any number of arguments, that has no side-effects, and that always returns //value//. ====Examples==== <blockquote> ([[CL:Functions:mapcar]] (constantly 3) '(a b c d)) <r>(3 3 3 3)</r> ([[CL:Macros:defmacro]] with-vars (vars &body forms) `(([[CL:Macros:lambda]] ,vars ,@forms) ,@([[CL:Functions:mapcar]] (constantly [[CL:Constant Variables:[[CL:Constant Variables:nil]]]]) vars))) <r>WITH-VARS</r> ([[CL:Functions:macroexpand]] '(with-vars (a b) ([[CL:Macros:setf]] a 3) ([[CL:Macros:setf]] b ([[CL:Functions:math-multiply|*]] a a)) ([[CL:Functions:list]] a b))) <r>(([[CL:Macros:lambda|LAMBDA]] (A B) (SETF A 3) (SETF B ([[CL:Functions:math-multiply|*]] A A)) ([[CL:Functions:list|LIST]] A B)) NIL NIL), //[[CL:Glossary:true]]//</r> </blockquote> ====Affected By==== None. ====Exceptional Situations==== None. ====See Also==== * **[[CL:Functions:identity|Function IDENTITY]]** ====Notes==== **constantly** could be defined by: <blockquote> ([[CL:Macros:defun]] constantly (object) #'([[CL:Symbols:lambda]] (&rest arguments) object)) </blockquote> \issue{FUNCTION-COMPOSITION:JAN89-X3J13}