Hi All

I'm looking for suggestions of how to retrieve values asynchronously:

In the synchronous world I have 

var num1 =  Object1.retrieveNum1();
var num2 = Object2.retrieveNum2();
var num3 = Object3.retrieveNum3();

var result = (num1 + num2) /  num3;


but since functions  Object1.retrieveNum1,Object2.retrieveNum2 & 
 Object3.retrieveNum3
retrieve data from the database or represent long calculation I need to 
pass callbacks,
that leads me to below
 
 Object1.retrieveNum1Async(function(num1){
      Object2.retrieveNum2Async(function(num2){
            Object3.retrieveNum3Async(function(num3){            
                 var result = (num1 + num2) /  num3;                  
            });
      });
});

is this the idiomatic way of doing this or there is something better


thanks
Bobi




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