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beginner · order 9

Map and and_then without unwrap

opt-map-01Related book chapters: 2 (optional — this page is complete on its own)Optionmapand_then

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.