//There are no classes in Rust
struct Settings ;
impl Settings {
const HOST: &'static str = "10.0.0.1";
const PORT: i32 = 3306;
fn get_connection() -> String {
format!("{}:{}",
Settings::HOST, Settings::PORT)
}
}
let connection = Settings::get_connection();
//connection is "10.0.0.1:3306"
println!("connection is '{connection}'");