Comment by packetlost

I frequently write software like this (in other domains). Structs exist (in most languages) specifically for the purpose of packaging up state to pass around, I don't really buy that passing around a huge context is the problem. I'm not opposed to long functions (they can frequently be easier to understand than deep callstacks), especially in languages that are strictly immutable like Clojure or where mutation is tightly controlled like Rust. Otherwise it really helps to break down problems into sub problems with discrete state and success/failure conditions, even though it results in more boilerplate to manage.