I read a lot of JRE/JDK source code (through IntelliJ, which probably comes from OpenJDK) just to see how they implement their classes. For example, I found ou

I read a lot of JRE/JDK source code (through IntelliJ, which probably comes from OpenJDK) just to see how they implement their classes. For example, I found out a few days ago that Collections.sort uses a dual pivot quicksort that I had never heard about before. I'm going to check out some Go stdlib next, I had no idea that was open source. Oh, and possibly the OpenBSD kernel.