JavaScript Exercises: Convert a Singly Linked list into a string

JavaScript Singly Linked List: Exercise-16 with Solution

Write a JavaScript program to convert a Singly Linked list into a string.

Sample Solution:

JavaScript Code:

// Define a class representing a node in a singly linked list
class Node {
    constructor(data) {
        // Initialize the node with provided data
        this.data = data;
        // Initialize the next pointer to null
        this.next = null;
    }
}

// Define a class representing a singly linked list
class SinglyLinkedList {
    constructor(Head = null) {
        // Initialize the head of the list
        this.Head = Head;
    }

    // Method to add a new node to the end of the list
    add(newNode) {
        // Start traversal from the head node
        let node = this.Head;
        // If the list is empty, set the new node as the head and return
        if (node == null) {
            this.Head = newNode;
            return;
        }
        // Traverse the list until the last node
        while (node.next) {
            node = node.next;
        }
        // Set the next pointer of the last node to the new node
        node.next = newNode;
    }

    // Method to convert the linked list to a string
    to_string() {
        // Initialize an empty string to store the elements of the list
        let current = this.Head;
        let str = "";
        // Traverse the list and concatenate each element to the string
        while (current) {
            str += current.data + " ";
            current = current.next;
        }
        return str;
    }

    // Method to display the elements of the list
    displayList() {
        // Start traversal from the head node
        let node = this.Head;
        // Initialize an empty string to store the elements of the list
        var str = "";
        // Traverse the list and concatenate each element to the string
        while (node) {
            str += node.data + "->";
            node = node.next;
        }
        // Append "NULL" to indicate the end of the list
        str += "NULL";
        // Print the string containing the list elements
        console.log(str);
    }
}

// Create an instance of the SinglyLinkedList class
let numList = new SinglyLinkedList();
// Add nodes with data values to the list
numList.add(new Node(12));
numList.add(new Node(13));
numList.add(new Node(14));
numList.add(new Node(15));
numList.add(new Node(14));
// Display the elements of the list
console.log("Singly Linked list:");
numList.displayList();
// Convert the linked list to a string
console.log("Converts the said Singly Linked Lists into a string:");
result = numList.to_string();
console.log(result);

// Create a new instance of the SinglyLinkedList class
let numList1 = new SinglyLinkedList();
// Display the elements of the empty list
console.log("New Singly Linked list:");
numList1.displayList();
// Convert the empty linked list to a string
console.log("Converts the said Singly Linked Lists into a string:");
result = numList1.to_string();
console.log(result);

Output:

"Singly Linked list:"
"12->13->14->15->14->NULL"
"Converts the said Singly Linked Lists into a string:"
"12 13 14 15 14 "
"New Singly Linked list:"
"NULL"
"Converts the said Singly Linked Lists into a string:"
""

Flowchart:

Live Demo:

See the Pen javascript-singly-linked-list-exercise-16 by w3resource (@w3resource) on CodePen.

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Singly Linked List Previous: Convert a Singly Linked list into an array.
Singly Linked List Next: Get index of an given element in a Singly Linked list.