JAVASCRIPT

linked list javascript

// Linked Lists of nodes
class Node {
  constructor(value) {
    this.value = value;
    this.next = null;
  }
}

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

  // Add a value at beginning of list
  addStart(value) {
    const node = new Node(value);
    node.next = this.head;
    this.head = node;
  }

  // Add a value at end of list
  addEnd(value) {
    const node = new Node(value);
    let curr = this.head;
    if (curr == null) {
      this.head = node;
      return;
    }

    while (curr !== null && curr.next !== null) {
      curr = curr.next;
    }

    curr.next = node;
  }
}

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

console.log(list.head.value); // 2 (head of list)

linkedlist javascript

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

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

let node1 = new ListNode(2);
let node2 = new ListNode(4);
node1.next = node2;

let list = new LinkedList(node1);

console.log(list.head.next);