x.js

var UserCollection = require("../dataSources/user")

var User = {
    findOrCreateLearnerBySkypeName: function (name, callback) {
        UserCollection.getBySkypeName(name, createIfMissing)

        function createIfMissing(err, user) {
            if (err) {
                return callback(err)
            }
            if (!user) {
                return UserCollection.createFromSkypeName(name, callback)
            }
            return callback(null, user)
        }
    }
}