fn main() {
    let numbers = [Some(42), None, Some(100)];
    
    for num in numbers.iter() {
        let value = num.unwrap_or(0);
        println!("Got: {}", value);
    }
    
    let result: Option<i32> = None;
    let value = result.unwrap_or_else(|| {
        println!("Computing default...");
        99
    });
    println!("Value: {}", value);
}