Linked List
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class Node {
constructor(value) {
this.value = value;
this.next = null;
}
}
class LinkedList {
constructor(value) {
this.head = {
value,
next: null,
};
this.tail = this.head;
this.length = 1;
}
append(value) {
// O(1)
const newNode = new Node(value);
this.tail.next = newNode;
this.tail = newNode;
this.length++;
}
prepend(value) {
// O(1)
const newNode = new Node(value);
newNode.next = this.head;
this.head = newNode;
this.length++;
}
printList() {
const array = [];
let currentNode = this.head;
while (currentNode !== null) {
array.push(currentNode.value);
currentNode = currentNode.next;
}
return array;
}
insert(index, value) {
if (index === 0) {
return this.prepend(value);
}
if (index >= this.length) {
return this.append(value);
}
let count = 0;
let prev = this.head;
const newNode = new Node(value);
while (prev.next !== null) {
if (count === index - 1) {
newNode.next = prev.next;
prev.next = newNode;
this.length++;
break;
}
prev = prev.next;
count++;
}
}
remove(index) {
if (index === 0) {
const newHead = this.head.next;
delete this.head;
this.head = newHead;
return;
}
let count = 0;
let prev = this.head;
while (prev.next !== null) {
if (count === index - 1) {
const deleteThis = prev.next;
delete prev.next;
prev.next = deleteThis.next;
this.length--;
break;
}
prev = prev.next;
count++;
}
}
reverse() {
let prev = null;
let currentNode = this.head;
while (currentNode !== null) {
const next = currentNode.next;
currentNode.next = prev;
prev = currentNode;
currentNode = next;
}
this.head = prev;
return this.printList();
}
}
const myLinkedList = new LinkedList(10);
myLinkedList.append(50);
myLinkedList.append(60);
myLinkedList.append(70);
myLinkedList.append(80);
myLinkedList.prepend(1);
myLinkedList.insert(10, 99);
myLinkedList.remove(0);
console.log(myLinkedList.printList());
console.log(myLinkedList.reverse())
JavaScript
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