The parallel function in Async should make this pretty easy
var async = require('async');
async.parallel([
function(callback){
Object1.retrieveNum1Async(function(err, num1){
callback(err, num1);
});
},
function(callback){
Object2.retrieveNum2Async(function(err, num2){
callback(err, num2);
});
},
function(callback){
Object3.retrieveNum3Async(function(err, num3){
callback(err, num3);
});
}
], function(err, results){
if(err) throw err;
// Your results will now be an array of [num1, num2, num3]
var temp = (results[0] + results[1]) / results[2];
);
Don't forget to add an Error as the first parameter to the callback in your
"retreiveAsync" functions.
On Monday, April 22, 2013 2:54:50 PM UTC-5, Slobodan Blazeski wrote:
>
> 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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