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<html><head><title>XLISP push</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>push</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 macro</nobr></td>
</tr>
<tr valign="top">
<td><nobr>Source:</nobr></td>
<td><nobr> - </nobr></td>
<td width="100%"><nobr>misc.lsp</nobr></td>
</tr>
</tbody></table></p>
<h2>Syntax</h2>
<p><div class="box">
<dl>
<dt>(<b>push</b> <i>expr list</i>)</dt>
<dd><i>expr</i> - an expression<br>
<i>list</i> - a list<br>
returns - the new value of <i>list</i></dd>
</dl>
</div></p>
<p>'push' is implemented as a Lisp macro:</p>
<pre class="example">
(defmacro <font color="#0000CC">push</font> (val lis)
`(setf ,lis (cons ,val ,lis)))
</pre>
<h2>Description</h2>
<p>The 'push' macro stores the value of the expression to the front of the
list and returns the list.</p>
<h2>Examples</h2>
<pre class="example">
(setq lst nil) => NIL
(push 1 lst) => (1)
lst => (1)
(push 2 lst) => (2 1)
lst => (2 1)
(push 3 lst) => (3 2 1)
lst => (3 2 1)
</pre>
<p>See <a href="setq.htm">setq</a>. See also the <a href="pop.htm">pop</a> macro.</p>
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