Checks whether an array of numbers is monotonically increasing or decreasing

rust_is_monotonic.rs

fn is_monotonic(data: &[u32]) -> bool {
    if data.len() <= 2 {
        return true;
    }

    let direction = data[1].cmp(&data[0]);
    for i in 2..data.len() {
        if breaks_direction(direction, data[i], data[i - 1]) {
            return false;
        }
    }
    true
}

fn breaks_direction(direction: Ordering, current: u32, previous: u32) -> bool {
    let difference = current.cmp(&previous);
    if direction != difference {
        return true;
    }
    false
}