title: Concat two nodelists
body: <p>I am trying to concat two nodelists using</p>
  
  <pre><code>var ul   = document.querySelector("ul");
  var down = document.getElementsByClassName("mobile")[0];
  var ul_child = Array.prototype.concat.call(ul.children,down.children);
  </code></pre>
  
  <p>But this returns only two nodes from ul nodelist and ignore others. What is the most valid to concat two nodelsits? I would like to avoid brute looping them </p>