title: Concat in an empty array in Javascript
body: <p>I was browsing through some code and I was wondering how this could be useful</p>
  
  <pre><code>grid.push([].concat(row));
  </code></pre>
  
  <p>In my understanding it is the same as</p>
  
  <pre><code>grid.push([row]);
  </code></pre>
  
  <p>Why the 'concat' fuss?</p>