Quiz

Question 1

What is the primary difference between panic!() and Result?

Question 2

Does the following successfully execute?

fn main() {
 panic!("{string}", string = ":(")
}

Question 3

Why does the following code fail to execute?

fn none() -> Option< char > {
 None
}

fn main() {
 println!("{:?}", none().unwrap())
}

Question 4

Fill in the blank in the following function with an appropriate type:

fn fail_result() -> Result < i32, > {
 Err(12.346)

}

Question 5

What is the printed output of the code below?

fn result_to_option(opt: Result < i32, char >) -> Option< i32 > {
 let new_option = Some(opt.ok()?);
 new_option
}

fn main() {
 let res = Err('a');
 println!("{:?}", result_to_option(res))
}