Zadania JavaScript 5

//ZAD 1
/*
const oferta = {
    marka:"Kia",
    model:"Carens",
    cena:60000,
    koszt100km: function(){
        return "37zł"
    }
}

document.write(oferta.koszt100km());
*/

//ZAD 2
/*
const pb95 = 6;
const oferta = {
    marka:"Kia",
    model:"Carens",
    cena:60000,
    spalanie:8,
    koszt100km: function(){
        return this.spalanie * pb95
    }
}

document.write(oferta.koszt100km());
*/

//ZAD 3
/*
const oferta = {
    marka:"Kia",
    model:"Carens",
    cena:60000,
    spalanie:8,
    koszt100km: function(){
        return this.spalanie * pb95
    },
    wiekSamochodu:function(){
        let x = prompt();
         x = parseInt(x);
        var d = new Date;
         d = d.getFullYear();
         d = parseInt(d);
        return d - x;
    }
}

document.write(oferta.wiekSamochodu());
*/

// ZAD 4

const oferta = {
    marka:"Kia",
    model:"Carens",
    cena:60000,
    spalanie:8,
    koszt100km: function(){
        return this.spalanie * pb95
    },
    wiekSamochodu:function(){
        let x = prompt();
         x = parseInt(x);
        var d = new Date;
         d = d.getFullYear();
         d = parseInt(d);
        return d - x;
    }
}

function Oferta(mk,md,c,s)
{
    this.marka = mk;
    this.model = md;
    this.cena =c;
    this.spalanie = s;
}

const oferta1 = new Oferta("Volkswagen","Touran",20000,7);
document.write(oferta1 + "<br>");
document.write(oferta1.marka + " " + oferta1.model + " " + oferta1.cena + " " + oferta1.spalanie);