zrozumiecReact.pl

const person = {
    name: "Jan",
    yearOfBirth: 1990
};

export default function App() {
    function useGetAge(yearOfBirth) {
        const date = new Date();
        const currentYear = date.getFullYear();
        return currentYear - yearOfBirth;
    }

    const age = useGetAge(person.yearOfBirth);
    
    return <h2>{person.name}, wiek: {age}</h2>
}