-not commenting
-leaving console logs behind in production
-not testing if it works in IE
-using root too much
-using if instead of switch
-never staying consistent with naming conventions
-starting projects and never finishing

NOT TESTING ON IE OMG. I was an intermediary between some external web devs and my firm. We were building a new ecommerce platform on a tight schedule. Core features were up, so we decided to launch early. Customers started screaming because they couldn't use the site on their ancient windows 7 office computers. ggwp.

The last 2... That's me

Code convention applied right is so sweet