There is a new edition of the book and this is an old link.
match
allows us to compare a value against a series of patterns and then execute code based on which pattern matches. Patterns can be made up of literal values, variable names, wildcards, and many other things.
enum Coin { Penny, Nickel, Dime, Quarter, } fn value_in_cents(coin: Coin) -> u32 { match coin { Coin::Penny => 1, Coin::Nickel => 5, Coin::Dime => 10, Coin::Quarter => 25, } }Run
Here are the relevant sections in the new and old books: