Stdle #24 · closures · 2026-06-30
What does this Rust snippet output?
A past puzzle — fully playable. 4 attempts, hints on wrong guesses.
fn main() { let v = vec![1, 2, 3]; let parts: Vec<String> = v.iter().map(|x| format!("#{}", x)).collect(); println!("{}", parts.join(","));}Closures