title: Incrementing variables in liquid without outputting them
body: <p>I am doing a for loop in shopify, I need to increment a variable.</p>
  
  <p>However, when I do</p>
  
  <pre><code>{% increment variable %}
  </code></pre>
  
  <p>besides incrementing it, it shows the output on the screen!</p>
  
  <p>I can't believe it. Is there a way to avoid this?</p>
  
  <p>Thank you</p>