e mathematical notion of lexicographical
  ordering, which has no connection to Unicode.  If you are sorting
  strings to present to the end user, use <code>String</code> APIs that
  perform localized comparison.
<strong>See Also:</strong> <code>lexicographicallyPrecedes(_:by:)</code></p>

    <h4>Declaration</h4>    
    <code class="language-swift">func lexicographicallyPrecedes&lt;OtherSequence where OtherSequence : Sequence, OtherSequence.Iterator.Element == Iterator.Element&gt;(_ other: OtherSequence) 