Remove single trailing newline from String without cloning

Question

I have written a function to prompt for input and return the result. In this version the returned string includes a trailing newline from the user. I would like to return th

Answer 1

You can use String::pop or String::truncate:

fn main() {
    let mut s = "hello\n".to_string();
    s.pop();
    assert_eq!("hello", &s);

    let mut s = "hello\n".to_string();
    let len = s.len();
    s.truncate(len - 1);
    assert_eq!("hello", &s);
}