In this blog we are going to learn how to find sum of linkedlist in javascript

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

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

  add(value) {
    const node = new Node(value);
    if (!this.head) {
      this.head = node;
      this.tail = node;
      return;
    }
    this.tail.next = node;
    this.tail = node;
  }

  sum() {
    let sum = 0;
    let node = this.head;
    while (node) {
      sum += node.value;
      node = node.next;
    }
    return sum;
  }
}

const list = new LinkedList();
list.add(1);
list.add(2);
list.add(3);

console.log(list.sum()); // 6