Implementation of Stack in JavaScript

stack.js

// Try edit message

class Node {
  constructor (value, nextNode) {
    this.value = value,
    this.nextNode = nextNode
  }
}

class Stack {
  constructor () {
    this.top = null;
  }

  push (value) {
    let newNode = new Node(value, this.top);
    this.top = newNode;

    console.log('PUSH');
    this.print();
  }

  pop () {
    let nodeToRemove = null;
    if(this.top) {
      nodeToRemove = this.top;
      this.top = this.top.nextNode;
    }
    
    console.log('PULL');
    this.print();

    return nodeToRemove;
  }


  print() {
    let ptr = this.top; // has to be referenced. Directly editing this.top won't work
    while(ptr != null) {
      console.log(ptr.value);
      ptr = ptr.nextNode;
    }
  }
}


let s = new Stack();

s.push(1);
s.push(2);
s.push(3);

s.pop();
s.pop();
s.pop();