> The point of a library function is that I don't have to worry about how it works, so I can focus on writing things that are not already in libraries! The poi

> The point of a library function is that I don't have to worry about how it works, so I can focus on writing things that are not already in libraries! The point of a library function is so it doesn't have to be re-implemented everywhere, not so you can be oblivious to how it works. If your oblivious to what is going on behind every function call you will write terrible code.