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<html><head><title>XLISP cons</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>cons</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>(cons <i>expr-car expr-cdr</i>)</dt>
<dd><i>expr-car</i> - an expression<br>
<i>expr-cdr</i> - an expression<br>
returns - the new list</dd>
</dl>
<h2>Description</h2>
<p>The 'cons' function takes two expressions and constructs a new list from
them. If the 'expr-cdr' is not a list, then the result will be a
'dotted-pair'.</p>
<h2>Examples</h2>
<pre class="example">
(cons 'a 'b) <font color="#008844">; returns (A . B)</font>
(cons 'a nil) <font color="#008844">; returns (A)</font>
(cons 'a '(b)) <font color="#008844">; returns (A B)</font>
(cons '(a b) '(c d)) <font color="#008844">; returns ((A B) C D)</font>
(cons '(a b) 'c) <font color="#008844">; returns ((A B) . C)</font>
(cons (- 4 3) '(2 3)) <font color="#008844">; returns (1 2 3)</font>
</pre>
<p>See the
<a href="../manual/xlisp-man-016.htm#cons">cons</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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