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<html><head><title>XLISP member</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>member</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>(member <i>expr list-expr</i> [{:test | :test-not} <i>test</i>])</dt>
<dd><i>expr</i> - the expression to find [an atom or a list]<br>
<i>list-expr</i> - the list to search<br>
<i>test</i> - optional test function, default is
<a href="eql.htm">eql</a><br>
returns - the remainder of the list starting with <i>expr</i></dd>
</dl>
<h2>Description</h2>
<p>The 'member' function searches through 'list-expr' for 'expr'. If found,
'member' returns the remainder of the 'list-expr' starting with 'expr'. If
'expr' is not found, a <a href="nil.htm">NIL</a> is returned. You
may specify your own test with the ':test' and ':test-not' keywords followed
by the test you which to perform.</p>
<h2>Examples</h2>
<pre class="example">
(member 'a '(1 2 3 4)) <font color="#008844">; returns NIL</font>
(member '2 '(1 2 3 4)) <font color="#008844">; returns (2 3 4)</font>
(setq mylist '(2 4 8 16 32 64 128 256)) <font color="#008844">; make a numeric list</font>
(member 6 mylist :test '<) <font color="#008844">; returns (8 16 32 64 128 256)</font>
(member 6 (reverse mylist) :test-not '<) <font color="#008844">; returns (4 2)</font>
(member '20 '(60 40 20 10) :test '> ) <font color="#008844">; returns (10)</font>
(member '(a) '((see) (a) (cat)) :test 'equal) <font color="#008844">; returns ((A) (CAT)) with EQUAL as test</font>
(member "hi" '("a" "hi" "c") :test 'string= ) <font color="#008844">; returns ("hi" "c") with STRING= as test</font>
</pre>
<p><b>Note:</b> The 'member' function can work with a list or string as the
'expr'. However, the default <a href="eql.htm">eql</a> test does
not work with lists or strings, only symbols and numbers. To make this work,
you need to use the ':test' keyword along with
<a href="equal.htm">equal</a> for 'test'.</p>
<p><b>Common Lisp:</b> Common Lisp supports the use of the ':key' keyword
which specifies a function that is applied to each element of 'list-expr'
before it is tested. XLISP does not support this.</p>
<p>See the
<a href="../manual/xlisp-man-016.htm#member">member</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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