">Array</span>.map</code></a>, but the
   function is applied to the index of the element as first argument,
   and the element itself as second argument.</p>
</div>
</div>

<pre><span id="VALfold_left"><span class="keyword">val</span> fold_left</span> : <code class="type">('a -&gt; 'b -&gt; 'a) -&gt; 'a -&gt; 'b array -&gt; 'a</code></pre><div class="info ">
<div class="info-desc">
<p><code class="code"><span class="constructor">Array</span>.fold_left&nbsp;f&nbsp;x&nbsp;a</code> computes
   <code class="co