Structs

Structs are nominally typed (meaning they must be exactly the same definition to be considered compatbile) data types that can have fields and methods

Example

src/structs.duck

struct Person {
    name: String,
    age: Int,
} impl {
    // static methods are like top level functions (so they can't use self)
    static fn new(name: String, age: Int) -> Person {
        Person {
            name: name,
            age: age,
        }
    }

    // mut methods have mutable access to self, meaning they can change the object
    mut fn change_name() {
        self.name = "Changed";
    }

    // normal methods may not mutate the object
    fn log_self() {
        //self.age = 10; <- error (because log_self is not a mut fn)
        std::io::println(f"{self.name} is {self.age.to_string()} years old");
    }
}

fn main() {
    let p = Person::new("John Smith", 43);
    p.log_self();
    p.change_name();
    p.log_self();
}