collection/MapMixin/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="type-annotation">V</span> <span class="parameter-name">ifAbsent</span>()</span>)
            <span class="returntype parameter">&#8594; V</span>
          </span>
        </dt>
        <dd>
          Look up the va