"type-parameter">RK</span>, <span class="type-parameter">RV</span>&gt;</span><span class="signature">(<wbr>)
            <span class="returntype parameter">&#8594; <a href="dart-core/Map-class.html">Map</a><span class="signature">&lt;<wbr><span class="type-parameter">RK</span>, <span class="type-parameter">RV</span>&gt;</span></span>
          </span>
                  </dt>
        <dd>
          Provides a view of this map as having <code>RK</code> keys and <code>RV</code> instances,
if necessary. <a href