Rust futures

Result

Unwrap

fn get_url(name: &String) -> Result<String, i32> {
    match name.as_str() {
        "Google" => Ok(String::from("https://google.com")),
        "Bing" => Ok(String::from("https://bing.com")),
        "" => Err(1),
        _ => Err(2),
    }
}

fn main() {
    let site: String = String::from("Google");
    let url: String = get_url(&site).unwrap();
    println!("Url of {} is {}", site, url);
    // Url of Google is https://google.com
}

If result is Err, then unwrap will panic:

fn main() {
    let site: String = String::from("Unknown");
    let url: String = get_url(&site).unwrap();
    println!("Url of {} is {}", site, url);
    // thread 'main' panicked at src/main.rs:27:38:
    // called `Result::unwrap()` on an `Err` value: 2
}