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<html><head><title>XLISP keywordp</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
<a href="../tutorials/tutorials.htm">Tutorials</a> |
<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>keywordp</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>Lisp function (closure)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>sal-parse.lsp</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<p><div class="box">
<dl>
<dt><nobr>(keywordp <i>expr</i>)</nobr></dt>
<dd><i>expr</i> - an arbitrary Lisp expression<br>
returns - <a href="t.htm"> T </a> if the expression is a keyword symbol, <a href="nil.htm">NIL</a> otherwise</dd>
</dl>
</div></p>
<pre class="example">
(defun <font color="#0000CC">keywordp</font> (s)
(and (symbolp s)
(eq (type-of (symbol-name s)) 'string)
(equal (char (symbol-name s) 0) #\:)))
</pre>
<h2>Description</h2>
<p>The 'keywordp' function tests if a lisp expression is a keyword symbol.</p>
<h2>Examples</h2>
<pre class="example">
(keywordp :a) => T
(keywordp :B) => T
(keywordp 'c) => NIL
(keywordp "d") => NIL
(keywordp #\e) => NIL
(keywordp 123) => NIL
</pre>
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