ode> as the initial value,
then iterates through the elements and updates the value with
each element using the <code>combine</code> function, as if by:</p>
<pre class="language-dart"><code>var value = initialValue;
for (E element in this) {
  value = combine(value, element);
}
return value;
</code></pre>
<p>Example of calculating the sum of an iterable:</p>
<pre class="language-dart"><code>iterable.fold(0, (prev, element) =&gt; prev + element);
</code></pre>
    </section>
    
    <section class="summary 