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linked-list-double.js
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linked-list-double.js
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class Node {
constructor(element) {
this.element = element;
this.prev = null;
this.next = null;
}
}
export default class LinkedListDouble {
constructor() {
this.head = null;
this.tail = null;
this.size = 0;
}
isEmpty() {
return this.size === 0;
}
getSize() {
return this.size;
}
prepend(value) {
const newNode = new Node(value);
if (this.isEmpty()) {
this.head = newNode;
this.tail = newNode;
} else {
newNode.next = this.head;
this.head.prev = newNode;
this.head = newNode;
}
this.size++;
}
append(value) {
const newNode = new Node(value);
if (this.isEmpty()) {
this.head = newNode;
this.tail = newNode;
} else {
this.tail.next = newNode;
newNode.prev = this.tail;
this.tail = newNode;
}
this.size++;
}
removeFromFront() {
if (this.isEmpty()) {
return "List is empty";
}
const value = this.head.element;
this.head = this.head.next;
this.head.prev = null;
this.size--;
return value;
}
removeFromEnd() {
if (this.isEmpty()) {
return "List is empty";
}
const value = this.tail.element;
if (this.size === 1) {
this.head = null;
this.tail = null;
} else {
this.tail = this.tail.prev;
this.tail.next = null;
}
this.size--;
return value;
}
reverse() {
if (this.isEmpty()) {
return "List is empty";
} else {
let current = this.head;
while (current) {
const nextNode = current.next;
current.next = current.prev;
current.prev = nextNode;
current = nextNode;
}
const head = this.head;
this.head = this.tail;
this.tail = head;
}
}
print() {
if (this.isEmpty()) {
return "List is empty";
} else {
let curr = this.head;
let list = [];
while (curr) {
list.push(curr.element);
curr = curr.next;
}
return list;
}
}
}