this map are transformed by
the given <code>f</code> function.
                  <div class="features">override</div>
</dd>
        <dt id="putIfAbsent" class="callable">
          <span class="name"><a href="dart-collection/MapView/putIfAbsent.html">putIfAbsent</a></span><span class="signature">(<wbr><span class="parameter" id="putIfAbsent-param-key"><span class="type-annotation">K</span> <span class="parameter-name">key</span>, </span> <span class="parameter" id="putIfAbsent-param-ifAbsent"><span class="t