I just started working on node.js and getting to know its concepts, I am having a little trouble understanding callbacks,what I am trying to do is call function getUserBranch() in the function getOffers().

I read that because of node.js async nature its better to use a callback function to get the desired data once the complete execution is done.

Now I am having trouble retrieving the value that getUserBranch is returning,I have no proper idea how to do it, well the callback function has the value but how do I get the value from there?

file2.js

var getUserBranch = function(email,callback) {





client.execute('SELECT * from branch WHERE email=?', [ email ], function(

        err, data, fields) {

    if (err)



        console.log(error);

    else

        console.log('The solution is in branch: n', data);

    res = data.rows[0];

    return callback(res);

});



}

file1.js

var getOffers = function (email) {



   var branchObj = require('./file2.js');

   var branchList = branchObj.getUserBranch(email,getList));

   return branchList;

};



var getList = function(res){

  var results=res;

  return results;

}