gistfile1.js

var models = [{
    name: 'Jonathan',
    location: 'Earth'
}, {
    name: 'Joe',
    location: 'Mars'
}]

models.forEach(function(model) {

    if (model.name) {
        nameFormatter.format(model.name, function(err, result) {
            model.name = result;
        });
    }

    if (model.location) {
        geocorder.geocode(model.location, function(err, result) {
            model.location = result;
        });
    }
    //Don't fire until async operations have updated the model.
    model.save();

});