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                /* OPIS
W poniższym przykładzie zależnie od wieku samochodu zwracany
jest tekst 1rok, 2lata ... 5lat, itd.
Mechanizm zrealizowano za pomocą instrukcji if, można jednak użyć, instrukcję swich, 
lub tablicę. 
let pb95=4;

const Oferta = {
            marka  : "Kia",
            model : "Carens",
            cena : 60000,
            spalanie: 8,
            rocznik: 2019,
            koszt100km : function() {
                let koszt = this.spalanie * pb95;
                return koszt;
            wiekSamochodu : function() {
                let data=new Date()
                let wiek=Number(data.getFullYear())-this.rocznik;
                if(wiek==1) { wiek=wiek+' rok'; }
                else if (wiek>1 && wiek <5) { wiek=wiek+' lata'; }
                else { wiek=wiek+' lat'; }
                return wiek;

console.log(Oferta.marka+' '+Oferta.model)
console.log('Koszt 100 km to: ' +Oferta.koszt100km()+' zł ');
console.log('Wiek pojazdu: ' + Oferta.wiekSamochodu());