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Stdle #121 · option · 2026-10-05

What does this Rust snippet output?

A past puzzle — fully playable. 4 attempts, hints on wrong guesses.

fn main() {
    let s: Option<String> = None;
    println!("[{}]", s.unwrap_or_default());
    let n: Option<i32> = None;
    println!("{}", n.unwrap_or_default());
    let b: Option<bool> = None;
    println!("{}", b.unwrap_or_default());
}
Option
3 lines
4 attempts left

Answer & explanation