with in normal use

Sometimes a with is just a with.

with when used in common English contexts.

#![allow(unused)]
fn main() {
// impl block for slices
impl <T> [T] {
    // A condition, but doesn't start with `is`, and uses `with` as a normal word.
    fn starts_with(&self, &[T]) -> bool;
}
}

  • Name fragments are not hard rules, they are guidance. Sometimes a method’s name will include words that break its pattern.

  • In this example with have starts_with, which is a boolean condition that does not start with “is” and is suffixed by “with”.

    If naming conventions were to be treated as hard rules, this would fail as a case.

    This is a good name for understanding what is going on at the callsite. We end up writing <variable>.starts_with(<sequence>) which scans well for authors and readers of code.

  • Remember: the point of naming conventions is predictability, and how predictability is in service of callsite clarity and readability.