f="Weak.html#TYPEt">t</a> -&gt; int</code></pre><div class="info ">
<code class="code"><span class="constructor">Weak</span>.length ar</code> returns the length (number of elements) of
   <code class="code">ar</code>.<br>
</div>

<pre><span id="VALset"><span class="keyword">val</span> set</span> : <code class="type">'a <a href="Weak.html#TYPEt">t</a> -&gt; int -&gt; 'a option -&gt; unit</code></pre><div class="info ">
<code class="code"><span class="constructor">Weak</span>.set ar n (<span class="constructo