Rust Pattern matching Sample

pattern-match.rs

#[derive(Debug)]

struct Action {
    _type: String,
    amount: u32
}

fn update_counter(state:u32, action: Action) -> u32 {
    let Action {_type, amount} = action;
    println!("{} {} {}", _type, amount, state);
    return match _type.as_str() {
        "INCREMENT" => state + amount,
        "DECREMENT" => state - amount,
        "RESET" => 0,
        _ => state
    };
}

fn main() {
    let action =  Action {
        _type: "INCREMENT".to_string(),
        amount: 2
    };

    let new_state = update_counter(4, action);

    println!("{:?}", new_state); // 6
}