Convert string to (integer) number - parse, turbofish

• i32

• parse

• expect

• ::<>()

• In the printing we won't see the difference, but we can do numberical operations on numbers.

• We can either define the expect type next to the variable name where we are assigning to.

• Or we can use the so-called turbofish operator ::<>() as we do in the second example.

fn main() {
    let text = "23";
    println!("{text:?}");
    println!();

    let number: i32 = text.parse().unwrap();

    println!("{number}",);
    println!("{}", number + 1);
    println!();

    let number = text.parse::<i32>().expect("Could not convert to i32");
    println!("{number}",);
    println!("{}", number + 1);

    let text = "3.14";
    let number = text.parse::<i32>().unwrap();
    //.expect("Could not convert to i32");
    println!("{number}",);
}

"23"

23
24

23
24