Empty string: Difference between revisions

===Lisp Syntax===

<lang lisp>

(setf emptystring "") ;binds variable'emptystring' to the empty string ""

(let ((emptystring "")) ;; Binds local variable 'emptystring' to the empty string ""

(when (string-equal emptystring "") ;;case insensitive string comparison

(print "Is an empty string")) ;;bad argument error if not a string

(when (stringp emptystring)

(print "Is a string"))

(when (not (stringp emptystring))

(print "Is not a string"))

(when (and (stringp emptystring)(= (length emptystring) 0))

(print "Is an empty string"))

(when (and (stringp emptystring)(> (length emptystring) 0))

(print "Is a non-empty string")))

</lang>

===SAL Syntax===

<lang sal>

define variable emptystring = "" ;binds variable'emptystring' to the empty string ""

if emptystring = "" then

print "is empty string"

else

print "is not empty string"

</lang>

===Audacity plug-in (LISP syntax)===

<lang lisp>

;nyquist plug-in

;version 4

(setq emptystring "") ;; Define global variable

(if (string= emptystring "") ;;case sensitive string comparison

"The string is empty."

"The string is not empty.")

</lang>

===Audacity plug-in (SAL syntax)===

<lang Nyquist>

;nyquist plug-in

;version 4

;codetype sal

;type tool

;name "Empty string"

define variable emptystring = "a" ;; Define global variable

;; The ternary operator is #?

return #?(emptystring = "",

"The string is empty.",

"The string is not empty.")

</lang>