What is the idiomatic way to pop the last N elements in a mutable Vec?

Question

I am contributing Rust code to RosettaCode to both learn Rust and contribute to the Rust community at the same time. What is the best idiomatic way to pop the last n

Answer 1

You should take a look at the Vec::truncate function from the standard library, that can do this for you.

(playground)

fn main() {
    let mut nums: Vec = Vec::new();
    nums.push(1);
    nums.push(2);
    nums.push(3);
    nums.push(4);
    nums.push(5);

    let n = 2;
    let new_len = nums.len() - n;
    nums.truncate(new_len);

    for e in nums {
        println!("{}", e)
    }
}