="nx">node</span><span class="p">[</span><span class="nx">key</span><span class="p">],</span><span class="w"> </span><span class="nx">accumulator</span><span class="p">)</span>
<span class="w">      </span><span class="p">}</span>
<span class="w">    </span><span class="p">}</span>
<span class="w">    </span><span class="k">this</span><span class="p">.</span><span class="nx">stack</span><span class="p">.</span><span class="nx">pop</span><span class="p">(</span><span class="nx">node</span><span class="p">)</