class Node {
constructor (value) {
this.value = value;
this.next = null;
}
}
class LinkedList {
constructor(value) {
this.head = new Node(value);
this.tail = this.head;
this.length = 1;
}
uppend(value) {
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;
}
insert(index, value) {
const newNode = new Node(99);
if(index === 0) {
this.prepend(value);
} else if (index >= this.length) {
this.uppend(value)
} else {
let i = 0;
let currentNode = this.head;
while(i < index - 1) {
currentNode = currentNode.next;
i++
}
// currentNode.next = newNode;
newNode.next = currentNode.next;
currentNode.next = newNode;
}
return this;
}
printList() {
const values = [this.head.value];
let currentNode = this.head;
while (currentNode.next) {
currentNode = currentNode.next;
values.push(currentNode.value);
}
console.log(values);
}
}
const myList = new LinkedList(5);
myList.uppend(10);
myList.uppend(15);
myList.prepend(60);
myList.prepend(30);
myList.insert(1, 99);
myList.printList();
