JavaScript Exercises: Insert a new node at the end of a Singly Linked List
JavaScript Singly Linked List: Exercise-6 with Solution
Write a JavaScript program to insert a new node at the end of a Singly Linked List.
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;
}
insertAt(index, newNode){
let node = this.Head;
if(index==0) {
newNode.next = node;
this.Head = newNode;
return;
}
while(--index){
if(node.next!==null)
node = node.next;
else
throw Error("Index Out of Bound");
}
let tempVal = node.next;
node.next = newNode;
newNode.next = tempVal;
}
insertLast(value) {
this.insertAt(numList.size(),value);
}
size() {
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(12));
numList.add(new Node(13));
numList.add(new Node(14));
numList.add(new Node(15));
numList.displayList();
console.log("Insert 200 at last position:")
numList.insertLast(new Node(200));
numList.displayList();
console.log("Insert 20 at last position:")
numList.insertLast(new Node(20));
numList.displayList();
Sample Output:
12->13->14->15->NULL Insert 200 at last position: 12->13->14->15->200->NULL Insert 20 at last position: 12->13->14->15->200->20->NULL
Flowchart:

Live Demo:
See the Pen javascript-singly-linked-list-exercise-6 by w3resource (@w3resource) on CodePen.
Improve this sample solution and post your code through Disqus
Singly Linked List Previous: Insert a new node at the beginning of a Singly Linked List.
Singly Linked List Next: Get a node in an existing singly linked list.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
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
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