SkillScore

How sharp is your Rust?

What the borrow checker accepts or rejects, and what your program really does when it runs.

Snippet0:42

What does this print?

struct Noisy(&'static str);

impl Drop for Noisy {
    fn drop(&mut self) {
        print!("{}", self.0);
    }
}

fn main() {
    let _a = Noisy("a");
    let _ = Noisy("b");
    let _c = Noisy("c");
    print!("-");
}

A taste of the format. The real bank adapts to your rating.

The ladder

Eight titles. One honest number.

Every full assessment lands you on one of eight rungs. Here is the whole climb, and what actually moves the number.

Only full assessments move it.

Gap re-checks never touch the rating, so the number is always earned.

Every answer adjusts the difficulty.

Beat questions above your level and the rating climbs fast, Elo style.

One attempt per 14 days.

Ratings stay honest because you cannot grind them daily.

Grandmaster1900+
Master1750+
Expert1600+
Advanced1450+
Proficient1300+
Practitioner1150+
Learner1000+
Noviceunder 1000

Your Rust rating is 20 questions away.

Free with any account. One attempt per 14 days, so bring your best.