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Rust 1.25.0
84203cac6

Closures

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

Anonymous functions you can save in a variable or pass as arguments to other functions.


let expensive_closure = |num| {
    println!("calculating slowly...");
    thread::sleep(Duration::from_secs(2));
    num
};Run

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