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+ <h2 class="chapter">Sequences, Arrays, and Vectors</h2>  <p>The <em>sequence</em> type is the union of two other Lisp types: lists and arrays. In other words, any list is a sequence, and any array is a sequence. The common property that all sequences have is that each is an ordered collection of elements. </p> <p>An <em>array</em> is a fixed-length object with a slot for each of its elements. All the elements are accessible in constant time. The four types of arrays are strings, vectors, char-tables and bool-vectors. </p> <p>A list is a sequence of elements, but it is not a single primitive object; it is made of cons cells, one cell per element. Finding the <var>n</var>th element requires looking through <var>n</var> cons cells, so elements farther from the beginning of the list take longer to access. But it is possible to add elements to the list, or remove elements. </p> <p>The following diagram shows the relationship between these types: </p> <div class="example"> <pre class="example">          _____________________________________________
+         |                                             |
+         |          Sequence                           |
+         |  ______   ________________________________  |
+         | |      | |                                | |
+         | | List | |             Array              | |
+         | |      | |    ________       ________     | |
+         | |______| |   |        |     |        |    | |
+         |          |   | Vector |     | String |    | |
+         |          |   |________|     |________|    | |
+         |          |  ____________   _____________  | |
+         |          | |            | |             | | |
+         |          | | Char-table | | Bool-vector | | |
+         |          | |____________| |_____________| | |
+         |          |________________________________| |
+         |_____________________________________________|
+</pre>
+</div> <table class="menu" border="0" cellspacing="0"> <tr>
+<td align="left" valign="top">• <a href="sequence-functions" accesskey="1">Sequence Functions</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Functions that accept any kind of sequence. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="arrays" accesskey="2">Arrays</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Characteristics of arrays in Emacs Lisp. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="array-functions" accesskey="3">Array Functions</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Functions specifically for arrays. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="vectors" accesskey="4">Vectors</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Special characteristics of Emacs Lisp vectors. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="vector-functions" accesskey="5">Vector Functions</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Functions specifically for vectors. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="char_002dtables" accesskey="6">Char-Tables</a>
+</td>
+<td> </td>
+<td align="left" valign="top">How to work with char-tables. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="bool_002dvectors" accesskey="7">Bool-Vectors</a>
+</td>
+<td> </td>
+<td align="left" valign="top">How to work with bool-vectors. </td>
+</tr> <tr>
+<td align="left" valign="top">• <a href="rings" accesskey="8">Rings</a>
+</td>
+<td> </td>
+<td align="left" valign="top">Managing a fixed-size ring of objects. </td>
+</tr> </table><div class="_attribution">
+  <p class="_attribution-p">
+    Copyright &copy; 1990-1996, 1998-2022 Free Software Foundation, Inc. <br>Licensed under the GNU GPL license.<br>
+    <a href="https://www.gnu.org/software/emacs/manual/html_node/elisp/Sequences-Arrays-Vectors.html" class="_attribution-link">https://www.gnu.org/software/emacs/manual/html_node/elisp/Sequences-Arrays-Vectors.html</a>
+  </p>
+</div>