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[xemacs-hg @ 2003-06-30 09:30:58 by stephent] doc improvements <87isqn9aly.fsf@tleepslib.sk.tsukuba.ac.jp> <8765mo9cmp.fsf@tleepslib.sk.tsukuba.ac.jp>
author stephent
date Mon, 30 Jun 2003 09:31:01 +0000
parents 576fb035e263
children b880e7bdec21
comparison
equal deleted inserted replaced
1548:5365af805d4c 1549:bc9eadea35cf
168 @end example 168 @end example
169 @end defun 169 @end defun
170 170
171 @defun listp object 171 @defun listp object
172 This function returns @code{t} if @var{object} is a cons cell or 172 This function returns @code{t} if @var{object} is a cons cell or
173 @code{nil}. Otherwise, it returns @code{nil}. 173 @code{nil}. Otherwise, it returns @code{nil}. @code{true-list-p} is
174 slower, but in some circumstances it is more appropriate.
174 175
175 @example 176 @example
176 @group 177 @group
177 (listp '(1)) 178 (listp '(1))
178 @result{} t 179 @result{} t
190 191
191 @example 192 @example
192 (listp @var{object}) @equiv{} (not (nlistp @var{object})) 193 (listp @var{object}) @equiv{} (not (nlistp @var{object}))
193 @end example 194 @end example
194 @end defun 195 @end defun
196
197 @defun true-list-p object
198 This function returns @code{t} if @var{object} is an acyclic,
199 @code{nil}-terminated (ie, not dotted), list. Otherwise it returns
200 @code{nil}. @code{listp} is faster.
195 201
196 @defun null object 202 @defun null object
197 This function returns @code{t} if @var{object} is @code{nil}, and 203 This function returns @code{t} if @var{object} is @code{nil}, and
198 returns @code{nil} otherwise. This function is identical to @code{not}, 204 returns @code{nil} otherwise. This function is identical to @code{not},
199 but as a matter of clarity we use @code{null} when @var{object} is 205 but as a matter of clarity we use @code{null} when @var{object} is