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What's Your Bus Number?
What's Your Bus Number?
SPEAKER: And the last sort of point I want to make about the sort of social stuff is does everybody know what a bus number is? Have you heard that before? It's the number of people who have to get hit by a bus before no one understands this file. Right? And everything in the code has a bus driver, and often the bus number is unfortunately like, one. Right? Which is bad. Again, another advocate of stuff like peer programming, pair programming, sorry. This is one of the arguments they use for pair programming is your bus number is never only one. At least one other person has seen all the code. And if we rotate pairs, a lot of people have seen all the code. It's not just if someone gets hit by a bus. But just for scheduling purposes, it's bad if a bunch of changes happen in some part of the code that need to happen now, and only one person can do it. Even just for scheduling, much less actually getting hit by a bus or leaving. It affects you all the time. So again, almost no matter what way you do code review, you can increase your bus number on as much of the code as you want.
