class Node{
constructor(val){
this.value=val;
this.next=null;
}
}
class Stack{
constructor(){
this.top=null;
this.bottom=null;
this.length=0;
}
push(val){
if (this.length ===0){
this.top = new Node(val);
this.bottom = this.top;
}else{
let currentTop = this.top;
this.top = new Node(val);
this.top.next =currentTop;
}
this.length++;
return this;
}
pop(){
let currentTop = this.top;
this.top = currentTop.next;
this.length--;
if (this.length===0){
this.bottom = null;
}
return this;
}
peek(){
return this.top;
}
}
const myStack = new Stack();
myStack.push('google');
myStack.push('udemy');
myStack.push('linkedin');
console.log(myStack.pop());
console.log(myStack.pop());
console.log(myStack.pop());
