w_val</code>, the binding is update to associate the key
    to <code class="code">new_val</code>.
<p>

    Other comments for <a href="Hashtbl.html#VALiter"><code class="code"><span class="constructor">Hashtbl</span>.iter</code></a> apply as well.<br>
<b>Since</b> 4.03.0<br>
</p></div>

<pre><span id="VALfold"><span class="keyword">val</span> fold</span> : <code class="type">('a -&gt; 'b -&gt; 'c -&gt; 'c) -&gt; ('a, 'b) <a href="Hashtbl.html#TYPEt">t</a> -&gt; 'c -&gt; 'c</code></pre><div class="info ">
<