What is the Best practice of exports function in Nodejs

Question

I am learning nodejs , I find two way to exports our function in Nodejs , but I can not find what is difference between in those The first is

module.exports.UserService = (function () {
return {
      getUser:getUser
}
})()

And another

var getUser=function(searchInfo,res){}
module.exports.getUser=getUser

Is there any disadvantage or advantage of using , or any other best practice for exports function

Answer 1

I always find it better to use the first notation (exporting the object via its reference) because:

1. it allows you to build the object incrementally, and
2. allows you to reference the object within itself.

e.g.:

var Obj = {};
Obj.attrs = { "prop1": "val1", "prop2": "val2" };
addSomeProperties(Obj); /* possibly based on Obj.attrs */
module.exports = Obj;