Function wrapper to avoid creating a new deferred in every function using the Q (http://documentup.com/kriskowal/q) library.

QWrapper.js

/** Wrapper Function **/
function _q (callback) {        
    return function () {
        var deferred = Q.defer(),
            args = [].slice.call(arguments, 0);

        args.unshift(deferred);
        callback.apply(null, args);
        
        return deferred.promise;
    }
};

/** Usage **/
var foo = _q(function (_d, arg1, arg2) {
    console.log('called function foo');
   	
    _d.resolve('foo resolved');
});