[NodeJS] Return a promise from your own function

return_promise_from_function.js

var mongo = require('mongodb');
var monk = require('monk');
var Promise = require('bluebird');

/* DB connection */
var dbName = '' 
var db = monk('localhost:27017/'+dbName);

/* replace <collection-name> with your collection*/
var collection = db.get(<collection-name>);

/* function getting values from DB and returning a promise */
var getValues = function(){
	return new Promise(function(resolve, reject){
		collection.find({},{'name':1},function(err,docs){
			if(err){reject(err);}
			else{resolve(docs);}
		});
	});
}

/* calling the function */
getValues()
	.then(function(data){
		console.log(data);
		db.close();
	 });
	.catch(function(err){ console.log(err); });