find the sum of all nodes in a linked list in javascript

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

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

  add(data) {
    const node = new Node(data);

    if (!this.head) {
      this.head = node;
    } else {
      let current = this.head;

      while (current.next) {
        current = current.next;
      }

      current.next = node;
    }
  }

  sumNodes() {
    let sum = 0;
    let current = this.head;

    while (current) {
      sum += current.data;
      current = current.next;
    }

    return sum;
  }
}

// Example usage
const list = new LinkedList();
list.add(3);
list.add(5);
list.add(1);
list.add(8);

console.log(list.sumNodes()); // Output: 17
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