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<html><head><title>XLISP remove-if</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> |
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<a href="../examples/examples.htm">Examples</a> |
<a href="reference-index.htm">Reference</a>
<hr>
<h1>remove-if</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>(remove-if <i>test list-expr</i>)</dt>
<dd><i>test</i> - the test function to be performed<br>
<i>list-expr</i> - the list to remove from<br>
returns - copy of list with matching elements removed</dd>
</dl>
<h2>Description</h2>
<p>The 'remove-if' function searches through 'list-expr' and removes any
elements that pass the 'test'. Note that this operation is non-destructive,
it does not modify or affect 'list-expr' directly, it creates a modified
copy.</p>
<h2>Examples</h2>
<pre class="example">
(setq mylist '(1 2 3 4 5 6 7 8)) <font color="#008844">; set up a list</font>
(remove-if 'oddp mylist) <font color="#008844">; returns (2 4 6 8)</font>
(remove-if 'evenp mylist) <font color="#008844">; returns (1 3 5 7)</font>
(print mylist) <font color="#008844">; prints (1 2 3 4 5 6 7 8)</font>
<font color="#008844">; note that MYLIST is not affected</font>
(setq mylist '(a nil b nil c)) <font color="#008844">; set up a list</font>
(remove-if 'null mylist) <font color="#008844">; returns (A B C)</font>
</pre>
<p><b>Common Lisp:</b> XLISP does not support the ':from-end', ':start',
':end', ':count' and ':key' keywords which Common Lisp does.</p>
<p>See the
<a href="../manual/xlisp-man-016.htm#remove-if">remove-if</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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