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<html><head><title>XLISP length</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>length</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>function (subr)</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>xllist.c</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<dl>
<dt>(length <i>expr</i>)</dt>
<dd><i>expr</i> - a list expression or string expression<br>
returns - the length of the list, array or string</dd>
</dl>
<h2>Description</h2>
<p>The 'length' function returns the length of the 'expr'. If the 'expr' is
a string, the number of characters is returned. If the 'expr' is a list, the
number of top level elements [atoms or sublists] is returned. If the list is
<nobr><a href="nil.htm">NIL</a> ,</nobr> a '0' is returned.</p>
<h2>Examples</h2>
<pre class="example">
(length NIL) <font color="#008844">; returns 0</font>
(length 'a) <font color="#008844">; error: bad argument type</font>
(length '(a)) <font color="#008844">; returns 1</font>
(length '(1 2 3 4 5 6)) <font color="#008844">; returns 6</font>
(length '(a (b c) (d (e) f) g)) <font color="#008844">; returns 4</font>
(length "12345") <font color="#008844">; returns 5</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-016.htm#length">length</a>
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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