de> returns <code class="code">Some y</code> if there is an element <code class="code">x</code> such
    that <code class="code">f x = Some y</code>, else it returns <code class="code">None</code><br>
</div>

<pre><span id="VALfindi"><span class="keyword">val</span> findi</span> : <code class="type">(int -> 'a -> 'b option) -> 'a <a href="Barray_slice.html#TYPEt">t</a> -> 'b option</code></pre><div class="info ">
Like <a href="Barray_slice.html#VALfind"><code class="code">Barray_slice.find</code></a>, but a