function displayDestinations(destinations) {
    if (
        !(destinations instanceof Map) ||
        destinations == null ||
        destinations == undefined ||
        destinations.size === 0
    ) {
        console.log("No destination is available.");
    } else {
        destinations.forEach((v, k) => {
            console.log(k + ": " + v);
        });
    }
}
function addDestination(destinations, name, cost) {
    if (
        typeof name != "string" ||
        typeof cost != "number" ||
        cost < 0 ||
        destinations.has(name)
    ) {
        return false;
    }

    destinations.set(name, cost);
    return true;
}
function removeDestination(destinations, name) {
    if (typeof name != "string" || !destinations.has(name)) {
        return false;
    } else {
        destinations.delete(name);
        return true;
    }
}
function getDestinationsInOrder(destinations) {
    const res = new Array();

    destinations.forEach((v, k) => res.push([v, k]));
    return res.sort((vkp1, vkp2) => vkp1[0] - vkp2[0]).map((vkp) => vkp[1]);
}
module.exports = {
    displayDestinations,
    addDestination,
    removeDestination,
    getDestinationsInOrder,
};