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Rust 1.30.1
1433507eb

if let

There is a new edition of the book and this is an old link.

The if let syntax lets you combine if and let into a less verbose way to handle values that match one pattern and ignore the rest.

let some_u8_value = Some(3u8);
if let Some(3) = some_u8_value {
    println!("three");
}Run

Here are the relevant sections in the new and old books: