title: Is it possible to determine number of children of any container using any SASS function?
body: <p>Is it possible to determine number of children of any container using any SASS function?</p>
  
  <p>For example, I have a container which has 3 columns:</p>
  
  <pre><code>    &lt;div class="columns columns_3"&gt;
          &lt;div class="column"&gt;&lt;/div&gt;
          &lt;div class="column"&gt;&lt;/div&gt;
          &lt;div class="column"&gt;&lt;/div&gt;
      &lt;/div&gt;
  </code></pre>
  
  <p>For this container, I want to implement a mixin which is <code>+columns_3</code>
  But if the container has nth number of children, mixin will be <code>+columns_n</code></p>