obiekty w js

zad 1
<!DOCTYPE html>
<html lang="pl">
<head>
<meta charset="utf-8" />
<script type="text/javascript">
let prod1 =
{
    name: "Mleko",
    price: 5,
    weight: 0.3
}
let prod2 =
{
    name: "Ketchup",
    price: 3,
    weight: 0.2
}

document.write("Produkt numer jeden to: ",prod1.name,"<br>");
document.write("Produkt numer jeden to: ",prod2.name,"<br>");
document.write("Produkty kosztuja razem: ",prod2.price+prod1.price,"<br>");
document.write("Produkty waza razem: ",prod2.weight+prod1.weight);

</script>
</head>
<body>
</body>
</html>

zad 2
<!DOCTYPE html>
<html lang="pl">
<head>
<meta charset="utf-8" />
<script type="text/javascript">
let currentUser =
{
    name: "Michal",
    surname: "Pilarski",
    email: "michalpilarski17@gmail.com",
    www: "www.sampleText.com",
    userType: "Klient",
    show: function()
    {
        document.write("Imie: ",this.name,"<br>");
        document.write("Nazwisko: ",this.surname,"<br>");
        document.write("Mail: ",this.email,"<br>");
        document.write("Strona: ",this.www,"<br>");
        document.write("Rodzaj uzytkownika: ",this.userType,"<br>");
    }
}
currentUser.show();

</script>
</head>
<body>
</body>
</html>

zad 3
<!DOCTYPE html>
<html lang="pl">
<head>
<meta charset="utf-8" />
<script type="text/javascript">
let a = 0;
let book =
{
    title: "Wiedzmin",
    author: "Sapkowski",
    pageCount: "300",
    publisher: "ZSE",
    showDetails: function()
    {
        for (const key in book)
        {
            a++;
            if(a<5)
            {
                document.write(key," ",book[key],"<br>");
            }
        }
    }
}
book.showDetails();

</script>
</head>
<body>
</body>
</html>