example2

;const userController = (function () {

    const fetchViruses = () => {
                fetch('/viruses')
                    .then((response) => response.json())
                    .then((json) => {
                        .....
                    });

    const fetchCapitals = () => {
                fetch('/cities')
                    .then((response) => response.json())
                    .then((json) => {
                        .....
                    });
            };

    return {
        fetchViruses,
        fetchCapitals
    }
})();