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Double.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
class Node {
constructor(data) {
this.data = data;
this.next = null;
this.prev = null;
}
}
class DoublyLinkedList {
constructor() {
this.head = null;
this.tail = null;
this.size = 0;
}
// Add a node at the end of the list
append(data) {
const newNode = new Node(data);
if (!this.head) {
this.head = newNode;
this.tail = newNode;
} else {
this.tail.next = newNode;
newNode.prev = this.tail;
this.tail = newNode;
}
this.size++;
}
// Add a node at the beginning of the list
prepend(data) {
const newNode = new Node(data);
if (!this.head) {
this.head = newNode;
this.tail = newNode;
} else {
newNode.next = this.head;
this.head.prev = newNode;
this.head = newNode;
}
this.size++;
}
// Insert a node at a specific index
insertAt(index, data) {
if (index < 0 || index > this.size) {
return null;
}
const newNode = new Node(data);
let current = this.head;
let previous;
if (index === 0) {
this.prepend(data);
return;
}
for (let i = 0; i < index; i++) {
previous = current;
current = current.next;
}
newNode.next = current;
newNode.prev = previous;
previous.next = newNode;
if (current) {
current.prev = newNode;
} else {
this.tail = newNode;
}
this.size++;
}
// Remove a node from a specific index
removeAt(index) {
if (index < 0 || index >= this.size) {
return null;
}
let current = this.head;
let previous;
if (index === 0) {
this.head = current.next;
if (this.head) {
this.head.prev = null;
} else {
this.tail = null;
}
} else {
for (let i = 0; i < index; i++) {
previous = current;
current = current.next;
}
previous.next = current.next;
if (current.next) {
current.next.prev = previous;
} else {
this.tail = previous;
}
}
this.size--;
return current.data;
}
// Print the list
printList() {
let current = this.head;
let result = '';
while (current) {
result += current.data + ' <-> ';
current = current.next;
}
console.log(result + 'null');
}
}
// Example usage
const dll = new DoublyLinkedList();
dll.append(10);
dll.append(20);
dll.append(30);
dll.prepend(0);
dll.insertAt(2, 15);
dll.removeAt(3);
dll.printList();
</script>
</body>
</html>