ss="signature">&lt;<wbr><span class="type-parameter"><a href="../../dart-core/String-class.html">String</a></span>&gt;</span></span>
                  <span class="name ">keys</span>
          <div class="features">override</div>
</section>
        
                <section class="desc markdown">
          <p>The keys of <a href="../../dart-html/MidiInputMap-class.html">this</a>.</p>
<p>The returned iterable has efficient <code>length</code> and <code>contains</code> operations,
based on <a href="../../dart