Stack in JavaScript.js

Stack in JavaScript.js

class Stack{
	
	constructor(){
		this.head = null;
	}
	
	push(data){
		var newNode = new Node(data);
		newNode.next = this.head;
		this.head = newNode;
	}
	
	pop(){
	
		var node = this.head;

		if(this.head !== null ){
			this.head = this.head.next;
		}else{
			return null;
		}
		
		return node.data;
	}
	
	peek(){
		if(this.head)
			return this.head.data;
	}
}

class Node{
	
	constructor(data){
		this.data = data;
		this.next = null;
	}

}

var stack = new Stack();
stack.push(1);
stack.push(2);
stack.push(3);
console.log(stack.pop());
console.log(stack.pop());
console.log(stack.pop());