Rust study : if let

if_let.rs

/*
The rust by example ko https://hanbum.gitbooks.io/rustbyexample/content/flow_control/if_let.html
compiled on https://play.rust-lang.org/
result :
Matched 7!
Not matched : letter
emoticon is None!
*/

fn main()
{
    let number = Some(7);
    let letter: Option<i32> = None;
    let emoticon: Option<i32> = None;
    
    if let Some(i) = number {
        println!("Matched {:?}!", i);
    }
    if let Some(i) = letter {
        println!("Matched {:?}!", i);
    }
    else {
        println!("Not matched : letter")
    }
    
    if emoticon == None {
        println!("emoticon is None!");
    }
}