This is a read-only archive of lispforum.com. The forum was locked to new users and posts and is preserved here as static HTML from a database snapshot taken on 2019-09-07.

Detect String

3 posts · 2134 views

anirban

#1 Sun Jan 15, 2012 9:14 pm

In CLISP, how to detect whether an object is a string or not?

Kompottkin

#2 Mon Jan 16, 2012 9:40 am

Re: Detect String

You can use STRINGP.

[1]> (stringp "abc")
T
[2]> (stringp 100)
NIL

In general, TYPECASE and CTYPECASE are often more useful.

(typecase x
  (string
   (format t "~&X is a string."))
  (number
   (format t "~&X is a number."))
  (t
   (format t "~&X is... something.")))

anirban

#3 Mon Jan 16, 2012 1:39 pm

Re: Detect String

Thanks everyone!