react js

1let count = Object.keys(myobj).length

1This is a formatted version of Komadori's answer 
2(https://tinyurl.com/Komadori)
3React is a JavaScript library for building user interfaces. 
4It is maintained by Facebook and a community of 
5individual developers and companies. 
6React can be used as a base in the development of single-page 
7or mobile applications.
8

1A JS Library that is considered one of the best frameworks/libraries of JS, Thi is Made by Facebook, If u want check out Clever Programmer, the god of React in Youtube

1//npm
2npx create-react-app my-app
3
4//yarn
5yarn create react-app my-react-app

1function Cart() {
2    const monsteraPrice = 8
3    const [cart, updateCart] = useState(0)
4    const [isOpen, setIsOpen] = useState(false)
5 
6    return isOpen ? (
7        <div className='lmj-cart'>
8            <button onClick={() => setIsOpen(false)}>Fermer</button>
9            <h2>Panier</h2>
10            <div>
11                Monstera : {monsteraPrice}€
12                <button onClick={() => updateCart(cart + 1)}>
13                    Ajouter
14                </button>
15            </div>
16            <h3>Total : {monsteraPrice * cart}€</h3>
17        </div>
18    ) : (
19        <button onClick={() => setIsOpen(true)}>Ouvrir le Panier</button>
20    )
21}
22

1// use npm package manager
2npx create-react-app my-app --use-npm