imum number of elements to return. The
  value of <code>maxLength</code> must be greater than or equal to zero.
<strong>Returns:</strong> A subsequence starting at the beginning of this sequence
  with at most <code>maxLength</code> elements.</p>

<p><strong>Complexity:</strong> O(1)</p>

    <h4>Declaration</h4>    
    <code class="language-swift">func prefix(_ maxLength: Int) -&gt; AnySequence&lt;LazyFilterSequence&lt;Base&gt;.Iterator.Element&gt;</code>
    
        <h4>Declared In</h4>
        <a href=