02. Bus Schedule

    function solve() {

        let currentStop = '';
        let nextStop = 'depot';

        function request(currentID){
            let url = `https://judgetests.firebaseio.com/schedule/${currentID}.json `;
            $.ajax({
                url,
                success,
                error
            });
        }
        function depart(){
            $('#depart').attr('disabled', true);
            $('#arrive').attr('disabled', false);
            request(nextStop);

        }
        function arrive() {
            $('#depart').attr('disabled', false);
            $('#arrive').attr('disabled', true);
            $('.info').text(`Arriving at ${currentStop}`);
        }

        function success(res){
            currentStop = res.name;
            $('.info').text(`Next stop ${currentStop}`);
            nextStop = res.next;
        }
        function error() {
            $('.info').text('Error');
            $('#depart').attr('disabled', true);
            $('#arrive').attr('disabled', true);
        }

        return {
            depart,
            arrive
        };
    }