In the examples below we show how to implement Linked List Data Structure in Javascript
class Node {
constructor(data, next=null)
this.data = data;
this.next = next;
}
}
class LinkedList {
constructor(data) {
this.head = null;
}
///////////
insertStart(data) {
this.head = new Node(data, this.head);
}
///////////
size() {
let cnt = 0;
let node = this.head;
while(node) {
cnt++;
node = node.next;
}
return cnt;
}
///////////
getAt(index) {
if (index == 0) {
return this.head;
}
let cnt == 0;
let node = this.head;
while(node) {
if (cnt == index) {
return node;
}
cnt++;
node = node.next;
}
return null;
}
///////////
removeLast() {
if (!this.head) {
return;
}
if (!this.head.next) {
this.head = null;
return;
}
let previous = this.head;
let node = this.head.next;
while (node.next) {
previous = node;
node = node.next;
}
previous.next = null;
}
}
///test
const l = new LinkedList();
l.insertStart('a');
console.log(l.size());
console.log(l.head.data);
