I really enjoy phrasing the problems in terms of where the state lives. The implicit state machine of where in the code you are and all the crud in your stack i

I really enjoy phrasing the problems in terms of where the state lives. The implicit state machine of where in the code you are and all the crud in your stack is so ingrained in how I reason about code, it's like it isn't even there at all! But if I have to think hard about state and state transitions on every yield point or whatever, it's a bit of a headache.