><code><span class="keyword">void</span></code></td><td><p>This has no return value.</p></td></tr></table></div><p>A <code>SliceCallback</code> is provided when using the <a href="/api/indexes/interfaces/indexes/indexes/methods/iterator/foreachslice/"><code>forEachSlice</code></a> method, so that you can do something based on every <a href="/api/indexes/type-aliases/concept/slice/"><code>Slice</code></a> in an <a href="/api/indexes/type-aliases/concept/index/"><code>Index</code></a>. See that method for spe