Example of chaining deferred promises

gistfile1.js

//
// Demonstration of chaining deferred promises together 
//

var Q = require('q');


function firstFunction () {
	var deferred = Q.defer();

	console.log('About to set timeout');

	setTimeout(deferred.resolve, 1000);

	console.log('Timeout set. Now resolving the promise');

	return deferred.promise;
}


function resolveFunction () {
	console.log('Then now executed');

	var deferred = Q.defer();

	console.log('About to set SECOND timeout');

	setTimeout(deferred.resolve, 2000);

	console.log('SECOND Timeout set. Now resolving the promise');

	return deferred.promise;
}


function secondResolveFunction () {
	console.log('secondResolveFunction executed');
}


var promise = firstFunction();
console.log('We now have a promise object, let\'s execute then');

promise
	.then(resolveFunction)
	.then(secondResolveFunction);