"keyword">val</span> find_first_opt : <span>(<a href="index.html#type-elt">elt</a> <span>&#45;&gt;</span> bool)</span> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> <span><a href="index.html#type-elt">elt</a> option</span></code></dt><dt class="spec value" id="val-find_last"><a href="#val-find_last" class="anchor"></a><code><span class="keyword">val</span> find_last : <span>(<a href="index.html#type-elt">elt</a> <span>&#45;&gt;</span> bool)</span> <span>&#45;&gt;</span> <a 