Closures¶

Closures are anonymous functions that can capture their environment, they can be assigned to a variable:

fn main() {

    fn add_one_v1(x:u32) -> u32 { x + 1}
    let add_one_v2 = |x:u32| -> u32 { x + 1 };

    println!("{}", add_one_v1(5));
    println!("{}", add_one_v2(5));

}

You can capture the environment in a closure in a following way:

let x = 4;
let equal=|z| z == x;

println!("{}", equal(4));
println!("{}", equal(5));

true
false