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<html><head><title>XLISP endp</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
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<hr>
<h1>endp</h1>
<hr>
<p><table cellpadding="0" cellspacing="0" style="margin-left:10px"><tbody>
<tr valign="top">
<td><nobr>Type:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>predicate function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xlbfun.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(endp <i>list</i>)</dt>
<dd><i>list</i> - the list to check<br>
returns - <a href="t.htm"> T </a> if the list is
empty, <a href="nil.htm">NIL</a> otherwise</dd>
</dl>
<h2>Description</h2>
<p>The 'endp' predicate function checks to see if 'list' is an empty list.
<a href="t.htm"> T </a> is returned if the list is
empty, <a href="nil.htm">NIL</a> is returned if the list is
not empty. The 'list' has to be a valid list. An error is returned if it
is not a list:</p>
<pre class="example">
<font color="#AA0000">error: bad argument type</font>
</pre>
<h2>Examples</h2>
<pre class="example">
(endp '()) <font color="#008844">; returns T - empty list</font>
(endp ()) <font color="#008844">; returns T - still empty</font>
(endp '(a b c)) <font color="#008844">; returns NIL</font>
(setq a NIL) <font color="#008844">; set up a variable</font>
(endp a) <font color="#008844">; returns T - value = empty list</font>
(endp "a") <font color="#008844">; error: bad argument type - "a"</font>
(endp 'a) <font color="#008844">; error: bad argument type - A</font>
</pre>
<p><b>Note:</b> The 'endp' predicate is different from the
<a href="null.htm">null</a> and
<a href="not.htm">not</a> predicates in that it requires a
valid list.</p>
<p>See the
<a href="../manual/xlisp-man-018.htm#endp">endp</a>
predicate function in the <nobr>XLISP 2.0</nobr> manual.</p>
<p><nobr> <a href="#top">Back to Top</nobr></a></p>
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