How to handle string comparison?

Question

I'm currently reading a file and need to compare the first line against a hardcoded value. I'm doing this:

let mut file = BufferedReader::new(File::open(path));
let mut first: bool = true;
for a_line in file.lines() {
    let line = a_line.unwrap();
    if first &&  line.as_slice() != "[tag]" {
        println!("Returning None");
        return None;
    }
    first = false;
}

I know first is true and println!("{}", line) shows it to be "[tag]" but the comparison always seems to return false. What am I missing?

Answer 1

There is probably a newline character in your line string. You can use the trim method and its variations on the string before taking a slice of it.