e next element and returns it, or <code>nil</code> if no next element
exists.</p>

<p>Once <code>nil</code> has been returned, all subsequent calls return <code>nil</code>.</p>

    <h4>Declaration</h4>    
    <code class="language-swift">mutating func next() -&gt; Element?</code>
    
    
</div></div>
</div>


