const weakMap = new WeakMap();
const objs = [{}, {}, {}];

objs.forEach((obj, index) => weakMap.set(obj, index + 1));

const result = objs.filter(obj => weakMap.has(obj)).map(obj => weakMap.get(obj) * 2);

console.log(result);

const obj1 = {
  name: "Alice",
  age: 25
};

const obj2 = {
  age: 30,
  city: "Wonderland"
};

with (obj1) {
  with (obj2) {
    name = "Bob";
    console.log(name, age);
  }
}

function* infiniteGenerator() {
  let i = 0;
  while (true) {
    yield i++;
  }
}

const weakMap = new WeakMap();
const gen = infiniteGenerator();

weakMap.set(gen, gen.next().value);

const result = weakMap.get(gen) + gen.next().value;

console.log(result);

import requests
from bs4 import BeautifulSoup

# URL وب‌سایت
url = 'https://example.com'

# ارسال درخواست
response = requests.get(url)

# چک کردن موفقیت درخواست
if response.status_code == 200:
    # تجزیه محتوا
    soup = BeautifulSoup(response.text, 'html.parser')
    
    # پیدا کردن عنصر مورد نظر (مثلاً یک عنوان)
    titles = soup.find_all('h1')
    
    # چاپ عنوان‌ها
    for title in titles:
        print(title.text)
else:
    print('خطا در بارگذاری وب‌سایت')

headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3'
}

response = requests.get(url, headers=headers)

function* gen() {
  yield* [1, 2, 3].map(x => x * 2);
}

const iterator = gen();
console.log(iterator.next().value);
console.log(iterator.next().value);
console.log(iterator.next().value);
console.log(iterator.next().value);

typeof null 
typeof undefined

function Product(name, price) {
  this.name = name;
  this.price = price;
}

Product.prototype.discount = function(discount) {
  this.price -= discount;
};

const product = new Product('Phone', 500);
product.discount(50);

console.log(product.price);

let obj1 = {"name" : "Amir"};
let obj2 = obj1;
let obj3 = {...obj1};
obj1.age = 120;
console.log(obj1.age,obj2.age,obj3.age);

npm install node-telegram-bot-api

const TelegramBot = require('node-telegram-bot-api');

// توکن ربات خود را از BotFather بگیرید
const token = 'YOUR_TELEGRAM_BOT_TOKEN';

// ایجاد یک نمونه از ربات
const bot = new TelegramBot(token, { polling: true });

// گوش دادن به پیام‌های جدید
bot.on('message', (msg) => {
    const chatId = msg.chat.id;
    bot.sendMessage(chatId, 'Hello World!');
});