 <span class="returntype parameter">&#8594; <a href="dart-core/Map-class.html">Map</a><span class="signature">&lt;<wbr><span class="type-parameter"><a href="dart-core/int-class.html">int</a></span>, <span class="type-parameter"><a href="dart-core/int-class.html">int</a></span>&gt;</span></span>
          </span>
                  </dt>
        <dd class="inherited">
          Returns an unmodifiable <a href="dart-core/Map-class.html">Map</a> view of <code>this</code>. <a href="dart-core/List/asMap.html">[..