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JavaScript Exercises: Count number of nodes in a Singly Linked List

JavaScript Singly Linked List: Exercise-3 with Solution

Write a JavaScript program to create a singly linked list of n nodes and count the number of nodes.

Sample Solution:

JavaScript Code:

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

class SinglyLinkedList {
    constructor(Head = null) {
        this.Head = Head
    }
add(newNode){
    let node = this.Head;
    if(node==null){
        this.Head = newNode;
        return;
    }
    while (node.next) {
        node = node.next;
    }
    node.next = newNode;}
 NodeCount() {
    let ctr = 0;
    let node = this.Head;
    while (node) {
        ctr++;
        node = node.next;
    }
    return ctr;
} 
 displayList(){
    let node = this.Head;
    var str = ""
    while (node) {
        str += node.data + "->";
        node = node.next;
    }
    str += "NULL"
    console.log(str);  
 } 
}
let numList = new SinglyLinkedList();
numList.add(new Node(2));
numList.add(new Node(3));
numList.add(new Node(4));
numList.add(new Node(5));
numList.add(new Node(6));
numList.add(new Node(7));
console.log("Original Linked list:")
numList.displayList();
var ctr = numList.NodeCount();
console.log("Number of elements in the said Linked list: "+ctr)


Sample Output:

Original Linked list:
2->3->4->5->6->7->NULL
Number of elements in the said Linked list: 6

Flowchart:

Flowchart: JavaScript Exercises: Count number of nodes in a Singly Linked List.

Live Demo:

See the Pen javascript-singly-linked-list-exercise-3 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Singly Linked List Previous: Print a singly linked list in reverse order.
Singly Linked List Next: Insert a new node at any position of a Singly Linked List.

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JavaScript: Tips of the Day

Shorten an array using its length property

A great way of shortening an array is by redefining its length property.

let array = [0, 1, 2, 3, 4, 5, 6, 6, 8, 9]
array.length = 4
// Result: [0, 1, 2, 3]

Important to know though is that this is a destructive way of changing the array. This means you lose all the other values that used to be in the array.

Ref: https://bit.ly/2LBj213