f the element as first argument,
   and the element itself as second argument.<br>
</div>

<pre><span id="VALfold_left"><span class="keyword">val</span> fold_left</span> : <code class="type">f:('a -&gt; 'b -&gt; 'a) -&gt; init:'a -&gt; 'b array -&gt; 'a</code></pre><div class="info ">
<code class="code"><span class="constructor">Array</span>.fold_left f x a</code> computes
   <code class="code">f (... (f (f x a.(0)) a.(1)) ...) a.(n-1)</code>,
   where <code class="code">n</code> is the length of the array 