gotoQ.js

var Q = require('q'),
    defered = Q.defer(),
    promise = defered.promise;

function heavyProcess(defered){
    setTimeout(function(){
        console.log('finish!')
        defered.resolve('end')
    }, 5000);
}

promise.then(function(msg){
    console.log(msg)
});

heavyProcess(defered);


//// after 5 sec, console logged 
// finish!
// end