This past week, I experienced a bug with RobotLegs where the EventMap.mapListener method would add the listener multiple times if called multiple times. Yesterday, I had some free time to dig a little deeper and managed to pinpoint the problematic code. It turns out the method didn’t check to see if the listener existed prior to adding to the array. This explains why a button click handler in my code would respond twice.

Thanks to the oh-so-wonderful GitHub, I was able to fork the repository, implement the fix, write a unit test to verify it’s safe, and find in the morning that it has been integrated into the actual RobotLegs repository—just like that. If you experienced the bug, be sure to pull the latest commit.

Now, if you’re not on GitHub, do yourself a favor and join today. In the few months I’ve been a member, I’ve met a handful of incredible developers and now feel compelled to share code when I can. Everyone benefits when you share what you know.