// Linked Lists
// let myLinkedList = {
// head: {
// value: 10,
// next: {
// value: 5,
// next: {
// value: 16,
// next: null
// }
// }
// }
// }
class Node {
constructor(value) {
this.value = value;
this.next = null;
}
}
class LinkedList {
constructor(value) {
this.head = {
value: value,
next: null
}
this.tail = this.head;
this.length = 1;
}
append(value) {
// add values to the linked list in the end
const newNode = new Node(value);
this.tail.next = newNode;
this.tail = newNode;
this.length++;
return this;
}
prepend(value) {
const newNode = new Node(value);
newNode.next = this.head
this.head = newNode
this.length++;
return this;
}
printList() {
const array = [];
let currentNode = this.head;
while (currentNode !== null) {
array.push[currentNode.value];
currentNode = currentNode.next;
}
console.log(array);
return array;
}
insert(index, value) {
// check params
if (index >= this.length) {
return this.append(value);
}
const newNode = new Node(value);
const leader = this.traverseToIndex(index-1);
const holdingPointer = leader.next;
leader.next = newNode;
newNode.next = holdingPointer;
this.length++;
return this.printList();
}
traverseToIndex(index) {
// check params
let counter = 0;
let currentNode = this.head;
while (counter !== index) {
currentNode = currentNode.next;
counter++;
}
return currentNode;
}
remove(index) {
// check params
const leader = this.traverseToIndex(index-1);
const unwantedNode = leader.next;
leader.next = unwantedNode.next;
this.length--;
return this.printList();
}
reverse() {
if (!this.head.next) {
return this.head;
}
let first = this.head;
this.tail = this.head;
let second = first.next;
while(second) {
const temp = second.next;
second.next = first;
first = second;
second = temp;
}
this.head.next = null;
this.head = first;
return this.printList();
}
}
const myLinkedList = new LinkedList(10);
myLinkedList.append(2);
myLinkedList.prepend(9);
myLinkedList.insert(2, 99);
myLinkedList.remove(2);
myLinkedList.printList();
