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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 72d218235f
commit f23f22d71c
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Task/Empty-string/Common-Lisp/empty-string.lisp Normal file
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(defparameter *s* "") ;; Binds dynamic variable *S* to the empty string ""
(let ((s "")) ;; Binds the lexical variable S to the empty string ""
(= (length s) 0) ;; Check if the string is empty
(> (length s) 0) ;; Check if length of string is over 0 (that is: non-empty)
;; (length s) returns zero for any empty sequence. You're better off using type checking:
(typep s '(string 0)) ;; only returns true on empty string
(typep s '(and string
(not (string 0))))) ;; only returns true on string that is not empty