Stack in js

stack impelmentation using class in js

class Stack {  count = 0;  storage = {};
  push = (value) => {    this.storage[this.count] = value;    this.count++;  };  pop = () => {    if (this.count === 0) {      return undefined;    }    this.count--;    var result = this.storage[this.count];    delete this.storage[this.count];    return result;  };  size = () => {    return this.count;  };  peek = () => {    return this.storage[this.count - 1];  };}
var mystack = new Stack();mystack.push(1);mystack.push(2);console.log(mystack.pop());console.log(mystack.peek());

Question

how to check a number is a pallandrome or now in js?

let letters = [];var words = "level";
var reverseWords = "";
for (let i = 0; i < words.length; i++) {  letters.push(words[i]);}for (let j = 0; j < words.length; j++) {  reverseWords += letters.pop();}if (reverseWords === words) {  console.log(words + "is a pallandrome");}