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<html><head><title>XLISP append</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>append</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>
<p><div class="box">
<dl>
<dt>(<b>append</b> [<i>expr</i> ... ])</dt>
<dd><i>expr</i> - a list or list expression<br>
returns - the new list</dd>
</dl>
</div></p>
<h2>Description</h2>
<p>The 'append' function takes an arbitrary number of lists and splices them
together into a single list. This single list is returned. <nobr>If
an</nobr> empty list <a href="nil.htm">NIL</a> is appended, it has no
effect, it does not appear in the final list. Remember that '(nil) is not an
empty list. <nobr>If a</nobr> list is appended to an atom, it also has no
effect and the atom will not appear in the final list.</p>
<h2>Examples</h2>
<pre class="example">
(append) => NIL
(append 'a 'b) => B
(append '(a) '(b)) => (A B)
(append 'a '(b)) => (B)
(append '(a) 'b) => (A . B)
(append '(a) nil) => (A)
(append (list 'a 'b) (list 'c 'd)) => (A B C D)
(append '(a (b)) '(c (d))) => (A (B) C (D))
(append '(a) nil nil nil '(b)) => (A B)
(append '(a) '(nil) '(b)) => (A NIL B)
</pre>
<p><b>Note:</b> If a list is appended to an atom, XLISP signals no error,
the atom just disappears!</p>
<p>See also:</p>
<ul>
<li><nobr>Contents → <a href="../manual/contents.htm#list-functions">List Functions</a></nobr></li>
</ul>
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<hr>
<a href="../start.htm">Nyquist / XLISP 2.0</a> -
<a href="../manual/contents.htm">Contents</a> |
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<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
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