Slug: opt-map-01 · Paired reading: Chapter 2
Prompt
Implement fn parse_even(s: &str) -> Option<i32> that parses an i32 and
yields Some only when the value is even. No unwrap.
Enter your book access code
The curriculum, drills, tutor, and interviewer mode are for readers of Ace the Rust Interview. The code is printed in the Preface (Companion site access).
Don’t have the book yet? Get it on Amazon (US and other storefronts linked in the site footer) — the Preface access code unlocks this gym.
beginner · order 9