Fixed vector of numbers

---

• A Vec vector is a series of values of the same type.
• We can initialize a vector using the vec! macro.
• We can get the length of the vector using the len method.
• We cannot print a vector with the simle {} placeholder because Display is not implemented for it.
• However we can use the {:?} or the {:#?} placeholders.
• By default vectors are immutable.

examples/vectors/numbers/src/main.rs

fn main() {
    let numbers = vec![10, 11, 12];
    println!("{}", numbers.len());

    // println!("{}", numbers);
    // `Vec<{integer}>` doesn't implement `std::fmt::Display`
    // `Vec<{integer}>` cannot be formatted with the default formatter

    println!("{:?}", numbers);
    println!("{:#?}", numbers);
}

3
[10, 11, 12]
[
    10,
    11,
    12,
]