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<html><head><title>XLISP mapl</title>
<link rel="stylesheet" type="text/css" href="reference.css">
</head>
<body>
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<hr>
<h1>mapl</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>(mapl <i>function list1</i> [<i>list2</i> ... ])</dt>
<dd><i>function</i> - a function definition like a
<a href="lambda.htm">lambda</a> form or a function name<br>
<i>listN</i> - a list or list expression<br>
returns - a list that is equivalent to <i>list1</i></dd>
</dl>
<h2>Description</h2>
<p>Tha 'mapl' function applies the 'function' to the successive
<a href="cdr.htm">cdr</a>s of each of the lists 'listN'. Each of
the lists supplies one of the arguments to 'function'. The 'mapl' function
returns a list that is equivalent to the first list 'list1'. It's purpose is
to perform operations that have side-effects. If the lists are of different
lengths, the shortest list will determine the number of applications of
'function'.</p>
<h2>Examples</h2>
<pre class="example">
(mapl 'print '(a b c)) <font color="#008844">; prints (A B C)</font>
<font color="#008844">; (B C)</font>
<font color="#008844">; (C)</font>
<font color="#008844">; returns (A B C)</font>
<font color="#008844">;; apply a lambda function to a list</font>
(mapl (lambda (x y) (princ x) (princ y) (terpri))
'(a b c) '(1 2 3)) <font color="#008844">; prints (A B C)(1 2 3)</font>
<font color="#008844">; (B C)(2 3)</font>
<font color="#008844">; (C)(3)</font>
<font color="#008844">; returns (A B C)</font>
</pre>
<p><b>Note:</b> The use of the 'function' will work properly when it is a
quoted symbol [the name of the function], an unquoted symbol whose value is
a function or a closure object like a
<a href="lambda.htm">lambda</a> form.</p>
<p>See the
<a href="../manual/xlisp-man-016.htm#mapl">mapl</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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