DoublyLinkedList - my version

class Node {
    constructor(value) {
        this.value = value;
        this.next = null;
        this.prev = null;
    }
}

class DoublyLinkedList {
    constructor(value) {
        this.head = {
            value: value,
            next : null,
            prev: null
        };
        this.tail = this.head;
        this.length = 1;
    }
    
    printList() {
        console.log(this);
        const list = [];
        let currentNode = this.head;
        while (currentNode !== null) {
            list.push(currentNode.value);
            currentNode = currentNode.next;
        }
        console.log(list);
    }
    
    append(value) {
        const newNode = new Node(value);
        
        if (this.length <= 1) {
            newNode.prev = this.head;
            this.head.next = newNode;
            this.tail = newNode;
            this.length++;
            // console.log(this);
            return this;
        }
        
        const currentTail = this.tail;
        newNode.prev = currentTail;
        this.tail.next = newNode;
        this.tail = newNode;
        this.length++;
        return this;
    }
    
    prepend(value) {
        const newNode = new Node(value);
        const currentHead = this.head;
        newNode.next = currentHead;
        this.head = newNode;
        this.length++;
        return this;
    }
}


const doublyLinkedList = new DoublyLinkedList(10);
doublyLinkedList.printList();
doublyLinkedList.append(5);
doublyLinkedList.append(42);
doublyLinkedList.append(782);
doublyLinkedList.append(300);
doublyLinkedList.prepend(300);
doublyLinkedList.printList();