RomanTurner

//Node
class Node {
  constructor(el){
    this.element = el;
    this.next = null;
  }
}

RomanTurner

class Stack {
  constructor(){
    this.length = 0;
    this.head = null;
  }

RomanTurner

   //Push data in the stack
   push = (el) => {
    //Create a new node
    let node = new Node(el),
    current;
    
    //Add the new node at the top
    current = this.head;
    node.next = current;
    this.head = node;

RomanTurner

  //Pop the item from the stack
   pop = () => {
    let current = this.head;
    
    //If there is item then remove it 
    //and make the next element as the first
    if(current){
      let el = current.element;
      current = current.next;
      this.head = current;

RomanTurner

 //Return the first element in the stack
  peek = () => {   
    if(this.head){    
      return this.head.element;
    }

    return null; 
  }

RomanTurner

//Convert the stack to an array
  toArray = () => {
    let arr = [];
    let current = this.head;
    while(current){
      arr.push(current.element);
      current = current.next;
    }
    
    return arr;

RomanTurner

class Stack {
  constructor(){
    this.length = 0;
    this.head = null;
  }
  
   //Push data in the stack
   push = (el) => {
    //Create a new node
    let node = new Node(el),

RomanTurner

class Queue{
 constructor(...items){
   //initialize the items in queue
   this._items = []
   // enqueuing the items passed to the constructor
   this.enqueue(...items)
 }

  enqueue(...items){
    //push items into the queue

RomanTurner

Read as much as you need till you feel like you have a grasp on the concept.

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RomanTurner

# Here is how I would implement Fizzbuzz with objects
# The main issue with your class is what's called
# single responsibility principle
# classes should do one thing and be about
# instances of those classes
# the fizzbuzz class should be about the loop
# just solving fizzbuzz individually

class Fizzbuzz
  attr_accessor :value