Send parameters between promises - node.js

Question

Im doing a asynchronous process with node.js. using promises. My code is like this:
var net = require('net');
var sqlite3 = require('sqlite3').verbose();
var db = new sqlite3.Database('MyBBDD.db');
var net = require('net');
var Q = require("q");
var firstFunction = function(v_user, v_mystring){
var deferred = Q.defer();
var mi;
stmt = db.prepare("SELECT text1 FROM my_table WHERE user = ?");
stmt.bind (v_user);
stmt.get(function(error,row){
if(!error && row){
deferred.resolve({string: v_mystring, query: row.text1});
}
deferred.reject(new Error(error));
});
return deferred.promise;
};
var secondFunction = function(result){
console.log(result.string);
console.log(result.query);
};
firstFunction('user000','Hello').then(secondFunction);
All in my code work fine but now, I want to concatenate in secondFunction my string received from firstFunction with other string for example "MyNewString".
Somebody know how can I solve it? Can I send "MyNewString" from my firstFunction to my secondFunction?
Thanks in advance.
Best regards.

Answer 1

The best to solve it will be resolve promise with object. Instead of returning just one value - result of querying DB you can return object that covers needed value.
With bind:
function firstFunction(string) {
return Promise.resolve({string: string, query: 'some result of query'})
}
function secondFunction(otherText, result) {
console.log(result.query) // you have still access to result of query
return result.string + otherText
};
firstFunction('foo').then(secondFunction.bind(null, 'bar')).then(console.log);
With closure
function firstFunction(string) {
return Promise.resolve({string: string, query: 'some result of query'})
}
function secondFunction(text) {
return function(result) {
return result.string + text
}
};
firstFunction('foo').then(secondFunction('bar')).then(console.log);
With anonymous function expression
function firstFunction(string) {
return Promise.resolve({string: string, query: 'some result'})
}
function secondFunction(text, otherText) {
return text.string + otherText
};
firstFunction('foo').then(function(result) {
return secondFunction(result, 'bar')
}).then(console.log);