-html/MidiInputMap/length.html">length</a> and <a href="../../dart-html/MidiInputMap/containsKey.html">containsKey</a> of the map.</p>
<p>The order of iteration is defined by the individual <code>Map</code> implementation,
but must be consistent between changes to the map.</p>
<p>Modifying the map while iterating the keys
may break the iteration.</p>
        </section>
                <section class="summary source-code" id="source">
          <h2><span>Implementation</span></h2>
          <pre class="langu