JavaScript Exercises: Clear a singly linked list by pointing the head towards null
JavaScript Singly Linked List: Exercise-10 with Solution
Write a JavaScript program to empty a singly linked list by pointing the head towards null.
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;
}
is_Empty(){
return (this.Head==null)
}
empty_list() {
this.Head = null;
}
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.add(new Node(14));
numList.displayList();
console.log("Empty the said list!")
numList.empty_list()
console.log("Check the said list is empty or not!")
console.log(numList.is_Empty())
Sample Output:
12->13->14->15->14->NULL Empty the said list! Check the said list is empty or not! true
Flowchart:

Live Demo:
See the Pen javascript-singly-linked-list-exercise-10 by w3resource (@w3resource) on CodePen.
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Singly Linked List Previous: Check whether a single linked list is empty or not.
Singly Linked List Next: Remove a node at the specified index in 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
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