title: substring in SASS
body: <p>I have the following variable in SASS:</p>
  
  <pre><code>$var = 45px
  $obj = $var
  </code></pre>
  
  <p>How can I remove the <code>px</code> from that value in SASS?</p>
  
  <p>Result:</p>
  
  <pre><code>$obj = 45
  </code></pre>