I'm trying to develop a module in Javascript and I try to generate rpc calls to query odoo database. I'm trying to do some calls from differents functions like that "obtener_id_empleado" and I'm trying to return the result to the main function but I always obtain undefined. Why?

In the ​console.log(result) I obtain an array of database data, but after the return and the assignment in console.log(empleado) I obtain undefined. Why? 

willStart: function () {

            var self = this;

​   var empleado = 0;

            empleado = this.obtener_id_empleado();

            console.log(empleado);  

 },

obtener_id_empleado: function(){

​rpc.query({

                model: 'hr.employee',

                method: 'search_read',

                args: [[['user_id', '=', this.getSession().uid]], ['name','id']],

​       context: session.user_context,

            })

            .then(function(result) {

​ ​console.log(result);

​ ​return result;

            });

},

Thanks