Method first

chapter 4/node.rs:48–54

(&self)

    }

    pub fn first(&self) -> Option<Node> {
        let inner = self.inner.read().unwrap();
        if let Some(node) = inner.first() {
            return Some(node.clone());
        }
        None
    }

    pub fn get_nodes(&self) -> Vec<Node> {
        self.inner.read().unwrap().to_vec()