Linked List : Creation & multiple operations

// 10-->5-->16

// let myLinkedList = {
//     head:{
//         value: 10,
//         next:{
//             value:5,
//             next:{
//                 value:16,
//                 next:null
//             }
//         }
//     }
// }

// 1-->10-->99-->5-->16-->88

class LinkedList {                // creating linked list with only 1 (head) value
    constructor(value){
        this.head = {
            value: value,
            next: null
        }
        this.tail = this.head;
        this.length = 1;
    }
    append(value){                // function to add value one by one to the end of the linked list
        const newNode = {
            value: value,
            next: null
        };
        this.tail.next = newNode; // tail's reference value will point to the new node
        this.tail = newNode;      // tail value will be updated with the value of new node 
        this.length++;
        return this;
    }
    prepend(value){               // function to add value one by one to the beginning of the linked list
        const newNode = {
            value:value,
            next:null
        };
        newNode.next = this.head; // newNode's reference value will now point to the head
        this.head = newNode;      // head value will be updated with the value of new node
        this.length++;
        return this
    }
    printList(){
        const array = [];
        let currentNode = this.head;
        while (currentNode !== null){
            array.push(currentNode.value);
            currentNode = currentNode.next;
        }
        console.log(array) 
    }
    insert(index,value){             //function to insert a value at a partiular index
        // check params
        if (index >= this.length){
            return this.append(value);
        }
        const newNode = {
            value:value,
            next:null
        };
        const leader = this.traverseToIndex(index-1)  // leader is at the index just before which index we want to insert a new node
        const holdingPointer = leader.next;   // we save the reference of the next node originally beside the leader , in temporary variable
        leader.next = newNode;
        newNode.next = holdingPointer;
        this.length++;
        return this.printList()
        }
        traverseToIndex(index){
            //check params
            let counter = 0;
            let currentNode = this.head;
            while (counter !== index){
                currentNode = currentNode.next;
                counter++;
            }
            return currentNode;
        }
    }

const myLinkedList = new LinkedList(10);
myLinkedList.append(5);
myLinkedList.append(16);
myLinkedList.prepend(1);
myLinkedList.insert(2,99);
myLinkedList.printList();
myLinkedList.insert(200,88);
myLinkedList.printList();
console.log(myLinkedList)