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<html><head><title>XLISP mapc</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>mapc</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>(mapc <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 - the first list of arguments</dd>
</dl>
<h2>Description</h2>
<p>The 'mapc' function applies the 'function' to the succesive
<a href="car.htm">car</a>s of each of the lists 'listN'. Each of
the lists supplies one of the arguments to 'function'. The 'mapc' 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">
(mapc 'princ '(hi there bob)) <font color="#008844">; prints HITHEREBOB</font>
<font color="#008844">; returns (HI THERE BOB)</font>
(mapc '+ '(1 2 3) '(1 2 3)) <font color="#008844">; returns (1 2 3)</font>
<font color="#008844">; there were no side effects</font>
(mapc (lambda (x y) (print (+ x y))) <font color="#008844">; define a function with side effects</font>
'(1 2 3) '(1 2 3)) <font color="#008844">; prints 2 4 6 </font>
<font color="#008844">; returns (1 2 3)</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#mapc">mapc</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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