Slobodan,
Sadly the node.js list sometimes generates more heat than light. Here's a
bit of the latter:
DB.retrieve('id1', cb); // start all retrieves in parallel, a key benefit
of Node
DB.retrieve('id2', cb); // providing the object name in the callback
arguments may require passing it to retrieve
DB.retrieve('id3', cb);
var vals = { length:3 }; // could also vals.length++ on each retrieve line
function cb(err, result) { // result is { name:string, value:number }
if (err) throw err; // or something more useful
vals[result.name] = result.value;
if (--vals.length > 0)
return;
// process vals here
}
Hope that helps.
On Monday, April 22, 2013 12:54:50 PM UTC-7, 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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