multiply-promise.js

exports.multiply = function (number, cb){
	setTimeout(function(){
		var result = number * 7;
		//console.log( number * 7)
		if (number == 6){
			return cb("6 is not allowed", null)
		}
		cb(null, result);
	},1000);	
}


exports.manualMultiply = function(){

	/*
	
	return new Promise(function (resolve, reject) {
        var xhr = new XMLHttpRequest;
        xhr.addEventListener("error", reject);
        xhr.addEventListener("load", resolve);
        xhr.open("GET", url);
        xhr.send(null);
    });
	
	
	*/


}

promises.js

var Promise = require("bluebird");

var multiply = Promise.promisifyAll(require('./multiply-promise')); 

/*
multiply.multiplyAsync(9)
	.then(function(result){
		console.log('----');
		console.log(result);
	}).then(function(){
		console.log('bye, bye!')
	});
*/

Promise.join(multiply.multiplyAsync(9),
			 multiply.multiplyAsync(7),
			 multiply.multiplyAsync(6),
			 multiply.multiplyAsync(3),
			 function(nine, seven, three){
			 	console.log(nine);
			 	console.log(seven);
			 	console.log(three);
			 }).error(function(err){
			 	console.log(err)
			 });;

/*
multiply.multiply(6, function(err, result){
	if (err){
		return console.log(err)
	}
	console.log(result);
});
*/

/*
multiply(9)
	.then(function(result){
		console.log(result);
	})
	.error(function(err){
		return console.log(err)	
	});

join(multiply(9), multiply(7), function(nine, seven){
	console.log(nine * seven);
});
*/

console.log('bye');