/span> <span class="p">{</span>
      <span class="kd">var</span> <span class="nx">source</span> <span class="o">=</span> <span class="nx">arguments</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span>
      <span class="nx">source</span> <span class="o">||</span> <span class="p">(</span><span class="nx">source</span> <span class="o">=</span> <span class="p">{});</span>

      <span class="k">for</span> <span class="p">(</span><span class="kd">var</span> <span class="nx">prop</sp