s/concept/index/"><code>Index</code></a>.</p></td></tr><tr><th class="right">returns</th><td><code><span class="type"><a href="/api/common/type-aliases/identity/ids/">Ids</a></span></code></td><td><p></p><p>The <a href="/api/indexes/type-aliases/concept/slice/"><code>Slice</code></a> <a href="/api/common/type-aliases/identity/ids/"><code>Ids</code></a> in the <a href="/api/indexes/type-aliases/concept/index/"><code>Index</code></a>, or an empty array.</p><p></p></td></tr></table></div><p>If the identified <