Async API Calls in Node Modules

somefile.js

// Because the ajax request is asynchronous, cannot assign data from api response to a variable in the success 
// callback and return it, because the return statement will execute before the success function is completed. 

// Instead, logic must happen inside of the success callback function.  
// This can either mean using jQuery to directly display the response:

exports.getHumidity = function(city) {
    $.get(url).then(function(response) {
        $('.showWeather').text("The humidity in " + city + " is " + response.main.humidity + "%");
    }).fail(function(error) {
      $('.showWeather').text(error.message);
    });
};

// Or it can be done by passing in display functions as arguments: 

exports.displaySuccess = function(apiData) {
    console.log("Yay! Call succeeded. ", apiData);
}

exports.displayError = function(err) {
    console.log("Noooo! Failure!!!" , err.message);
}

exports.getHumidity = function(city) {
    $.get(url).then(function(response) {
        exports.displaySuccess(response);
    }).fail(function(error) {
        exports.displayError(error);
    });
};