title: SASS and Bootstrap - mixins vs. @extend
body: <p>I'm using the <a href="https://github.com/twbs/bootstrap-sass" rel="noreferrer">SASS port of Bootstrap</a>, and I'm wondering if there's any difference between using the pre-defined mixins and using SASS's <code>@extend</code>.</p>
  
  <p>For instance, if I have:</p>
  
  <pre><code>&lt;div class="wrapper"&gt;
      Some content here....
  &lt;/div&gt;
  </code></pre>
  
  <p>Is there any difference between doing</p>
  
  <pre><code>.wrapper {
      @include make-row();
  }
  </code></pre>
  
  <p>and</p>
  
  <pre><code>.wrapper {
      @extend .row;
  }
  </code></pre>
  
  <p>?</p>
  
  <p>If there's no difference, are there other mixins that aren't equivalent to a single <code>@extend</code> statement? If there aren't such mixins, why do the mixins even exist?</p>