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<span id="length"></span><div class="header">
<p>
Next: <a href="reverse.html" accesskey="n" rel="next">reverse</a>, Previous: <a href="count.html" accesskey="p" rel="prev">count</a>, Up: <a href="Sequences-Dictionary.html" accesskey="u" rel="up">Sequences Dictionary</a> </p>
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<span id="length-_005bFunction_005d"></span><h4 class="subsection">17.3.11 length [Function]</h4>
<p><code>length</code> <i>sequence</i> ⇒ <i>n</i>
</p>
<span id="Arguments-and-Values_003a_003a-363"></span><h4 class="subsubheading">Arguments and Values::</h4>
<p><i>sequence</i>—a <i>proper sequence</i>.
</p>
<p><i>n</i>—a non-negative <i>integer</i>.
</p>
<span id="Description_003a_003a-478"></span><h4 class="subsubheading">Description::</h4>
<p>Returns the number of <i>elements</i> in <i>sequence</i>.
</p>
<p>If <i>sequence</i> is a <i>vector</i> with a <i>fill pointer</i>,
the active length as specified by the <i>fill pointer</i> is returned.
</p>
<span id="Examples_003a_003a-345"></span><h4 class="subsubheading">Examples::</h4>
<div class="example">
<pre class="example"> (length "abc") ⇒ 3
(setq str (make-array '(3) :element-type 'character
:initial-contents "abc"
:fill-pointer t)) ⇒ "abc"
(length str) ⇒ 3
(setf (fill-pointer str) 2) ⇒ 2
(length str) ⇒ 2
</pre></div>
<span id="Exceptional-Situations_003a_003a-159"></span><h4 class="subsubheading">Exceptional Situations::</h4>
<p>Should be prepared to signal an error of <i>type</i> <b>type-error</b>
if <i>sequence</i> is not a <i>proper sequence</i>.
</p>
<span id="See-Also_003a_003a-389"></span><h4 class="subsubheading">See Also::</h4>
<p><a href="list_002dlength.html">list-length</a>
,
<b>sequence</b>
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