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<h2>LEN</h2>length of a list
<pre>Major Section: <a href="PROGRAMMING.html">PROGRAMMING</a>
</pre><p>
<code>Len</code> returns the length of a list.
<p>
A Common Lisp function that is appropriate for both strings and
proper lists is <code>length</code>; see <a href="LENGTH.html">length</a>. The guard for <code>len</code> is <code>t</code>.<p>
(Low-level implementation note. ACL2 provides a highly-optimized
implementation of <code>len</code>, which is tail-recursive and fixnum-aware, that
differs from its simple ACL2 definition.)
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