class Node {
constructor(value){
this.value = value;
this.next = null;
}
}
class Stack {
constructor(){
this.top = null;
this.bottom = null;
this.length = 0
}
push(value){
if(!value) return;
let newNode = new Node(value);
if(this.length === 0) {
this.bottom = newNode;
this.top = newNode;
}else{
newNode.next = this.top
this.top = newNode
}
this.length++;
}
peek(){
return this.top.value;
}
pop(){
if(this.length === 0) return null
let removedVal = this.top.value;
if(this.length === 1){
this.bottom = null;
this.top = null;
}else{
this.top = this.top.next;
}
this.length--;
return removedVal;
}
}
const stack = new Stack();
stack.push(45)
stack.push(50)
stack.push(80)
stack.push(801)
stack.push(8011)
stack.push(80112)
console.log(stack);
console.log(stack.peek())
console.log(stack.pop())
console.log(stack.pop())
console.log(stack.pop())
console.log(stack.pop())
console.log(stack.pop())
console.log(stack.pop())
console.log(stack.pop())
console.log(stack.pop())
