Closures Basics

fn main() {
    let add = |a: i32, b: i32| a + b;
    println!("{}", add(2, 3));
}

fn main() {
    let factor = 2;
    let scale = |x| x * factor;
    println!("{}", scale(5));
}

use std::thread;
 
fn main() {
    let msg = String::from("hi");
    thread::spawn(move || println!("{msg}"));
}

fn main() {
    let v: Vec<_> = (0..5).map(|n| n * 2).collect();
    println!("{:?}", v);
}

fn apply(f: impl Fn(i32) -> i32, x: i32) -> i32 { f(x) }

fn main() {
    let mut count = 0;
    let mut inc = || { count += 1; };
    inc();
    println!("{count}");
}

fn make_adder(n: i32) -> impl Fn(i32) -> i32 {
    move |x| x + n
}