add a node to the end of a linked list in javascript

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

class LinkedList {
  constructor() {
    this.head = null;
  }

  addNode(value) {
    const newNode = new Node(value);

    if (!this.head) {
      // if linked list is empty, set head to new node
      this.head = newNode;
    } else {
      let current = this.head;

      while (current.next) {
        // traverse linked list until you reach the last node
        current = current.next;
      }

      current.next = newNode; // set last node's next pointer to new node
    }

    newNode.next = null; // set new node's next pointer to null (tail)
  }
}
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index.tsx
const linkedList = new LinkedList();
linkedList.addNode(1);
linkedList.addNode(2);
linkedList.addNode(3);
console.log(linkedList); // output: LinkedList { head: Node { value: 1, next: Node { value: 2, next: Node { value: 3, next: null } } } }
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