fn vs. function is probably the least of your concerns when reading and writing rust. Lifetimes, generic parameters, and complex where clauses are what will thr

fn vs. function is probably the least of your concerns when reading and writing rust. Lifetimes, generic parameters, and complex where clauses are what will throw you. But if you spend enough time with the language it gets easy enough for these to not be a concern. I personally think it's very much worth learning.