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<span id="Array-Lists"></span><div class="header">
<p>
Next: <a href="Queues.html" accesskey="n" rel="next">Queues</a>, Up: <a href="Data-Structures.html" accesskey="u" rel="up">Data Structures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
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<hr>
<span id="Array-Lists-1"></span><h4 class="subsection">5.6.1 Array Lists</h4>
<p>The <code>(chickadee data array-list)</code> module provides an array/vector
that dynamically expands to hold all of the data that is added to it.
It is named after the <code>ArrayList</code> class in Java.
</p>
<p>In addition to being used as a dynamic vector, it can also be used as
a stack via the <code>array-list-push!</code> and <var>array-list-pop!</var>
procedures.
</p>
<dl>
<dt id="index-make_002darray_002dlist">Procedure: <strong>make-array-list</strong> <em>[initial-capacity]</em></dt>
<dd><p>Return a new empty array list with an initial capacity of
<var>initial-capacity</var>, or 32 by default.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist">Procedure: <strong>array-list</strong> <em>items ...</em></dt>
<dd><p>Return a new array list with <var>items</var> in it.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_003f">Procedure: <strong>array-list?</strong> <em>obj</em></dt>
<dd><p>Return <code>#t</code> if <var>obj</var> is an array list.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dempty_003f">Procedure: <strong>array-list-empty?</strong> <em>array-list</em></dt>
<dd><p>Return <code>#t</code> if <var>array-list</var> is empty.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dsize">Procedure: <strong>array-list-size</strong> <em>array-list</em></dt>
<dd><p>Return the current size of <var>array-list</var>.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dref">Procedure: <strong>array-list-ref</strong> <em>array-list i</em></dt>
<dd><p>Return the item in <var>array-list</var> at index <var>i</var>.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dset_0021">Procedure: <strong>array-list-set!</strong> <em>array-list i value</em></dt>
<dd><p>Set the value in <var>array-list</var> at index <var>i</var> to <var>value</var>.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dpush_0021">Procedure: <strong>array-list-push!</strong> <em>array-list item</em></dt>
<dd><p>Append <var>item</var> to <var>array-list</var>.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dpop_0021">Procedure: <strong>array-list-pop!</strong> <em>array-list</em></dt>
<dd><p>Remove and return the last object in <var>array-list</var>.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002ddelete_0021">Procedure: <strong>array-list-delete!</strong> <em>array-list item [#:equal? equal?] [#:fast? #f]</em></dt>
<dd><p>Delete <var>item</var> from <var>array-list</var>. Use <var>equal?</var> as the
equivalence predicate, which defaults to Guile’s <code>equal?</code>
procedure. By default, deletion preserves the order of the array, but
takes linear time in the worst case. If <var>fast?</var> is <code>#t</code> then
<var>item</var> will deleted in constant time, but order is not preserved.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dclear_0021">Procedure: <strong>array-list-clear!</strong> <em>array-list</em></dt>
<dd><p>Remove all items from <var>array-list</var>.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dfor_002deach">Procedure: <strong>array-list-for-each</strong> <em>proc array-list</em></dt>
<dd><p>Apply PROC with each item in <var>array-list</var>.
</p></dd></dl>
<dl>
<dt id="index-array_002dlist_002dfold">Procedure: <strong>array-list-fold</strong> <em>proc init array-list</em></dt>
<dd><p>Apply <var>proc</var> to all items in <var>array-list</var> to build a result and
return that result. <var>init</var> is the initial result. If there are
no objects in the vicinity of <var>rect</var>, just <var>init</var> is returned.
</p></dd></dl>
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