> Ex of bad question: Implement a stringbuilder. We used to ask people to implement standard date-related functions. "That's stupid, all the date functions are

> Ex of bad question: Implement a stringbuilder. We used to ask people to implement standard date-related functions. "That's stupid, all the date functions are already written, and they handle all the weird edge cases for you!" That's right - we want to see if you can think about all the weird edge cases. It's not about the obvious functions, it's about whether or not you can plan reasonable interfaces and think about edge cases.