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Rust 1.29.0

if

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

An if expression allows us to branch our code depending on conditions.

fn main() {
    let number = 3;

    if number < 5 {
        println!("condition was true");
    } else {
        println!("condition was false");
    }
}Run

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