At DataCamp you can play with an online version of swirl:
<a href="https:&#x2F;&#x2F;www.datacamp.com&#x2F;courses&#x2F;r-programming-with-swirl" rel="nofollow">https:&#x2F;&#x2F;www.datacamp.com&#x2F;courses&#x2F;r-programming-with-swirl</a>