class Node{
constructor(value){
this.value=value;
this.next=null;
}
}
class Stack{
constructor(){
this.top=null;
this.bottom=null;
this.length=0;
}
peek(){
return this.top;
}
push(value){
const newNode=new Node(value);
if(this.length===0){
this.top=newNode;
this.bottom=newNode;
}
else{
const holdingPointer=this.top;
this.top=this.newNode;
this.top.next=holdingPointer;
}
this.length++;
return this;
}
pop(){
if(!this.top){
return null;
}
if(this.top===this.bottom){
this.bottom=null;
}
else{
const holdingPointer=this.top;
this.top=this.top.next;
this.length--;
}
return this;
}
}
const myStack=new Stack();
myStack.push('google');
myStack.push('udemy');
myStack.push('discord');
myStack.pop();
myStack.peek();
class Node{
constructor(value){
this.value=value;
this.next=null;
}
}
class Queue{
constructor(){
this.first=null;
this.last=null;
this.length=0;
}
enqueue(value){
const newNode=new Node(value);
if(this.length===0){
this.first=newNode;
this.last=newNode;
}
else{
this.last.next=newNode;
this.last=newNode;
}
this.lenth++;
return this;
}
dequeue(){
if(!this.first){
return null
}
if(this.first===this.last){
this.last=null;
}
const holdingPointer=this.first;
this.first=this.first.next;
this.length--;
return this;
}
peek(){
return this.first();
}
}
const myQueue=new Queue();
myQueue.peek();
