How can I pattern match against an Option?

Question

I can straight-forwardly match a String in Rust:

let a = \"hello\".to_string();

match &a[..] {
    \"hello\" => {
        println!(\"Mat         


        

Answer 1

In some cases, you can use unwrap_or to replace Option::None with a predefined &str you don't want to handle in any special way.

I used this to handle user inputs:

let args: Vec = env::args().collect();

match args.get(1).unwrap_or(&format!("_")).as_str() {
    "new" => {
        print!("new");
    }
    _ => {
        print!("unknown string");
    }
};

Or to match your code:

let option = Some("hello");

match option.unwrap_or(&format!("unhandled string").as_str()) {
    "hello" => {
        println!("hello");
    }
    _ => {
        println!("unknown string");
    }
};