[AngularJS] angular2 observable interval - Deal with out-of-order responses

[Yashavanta]

I have a scenario where I need to call a service method(which will call 
HTTP post method) repetitively until I get the results and for that I am 
using interval.

In below code the getReportResultsList(id)method will be get called in the 
interval of 100 ms.


The problem is, the server may take 300 ms time to process the first 
request and return the results.

But at the same time 2 more requests are going to the server to get the 
results because of interval(100). 

So after getting the results from the first request i don't want to process 
the unexpected 2nd and 3rd requests response results.


So I don't want to process the 2nd and 3rd responses. Can any one know how 
to to deal with these out of order responses?

Thanks.


let subscriber = Observable.interval(100).subscribe(() => {
                   this.reportService.getReportResultList(id)
                   .subscribe(result => {
                     this.reportResults = result;
                     if (this.reportResults) {
                       this.prepareViewData(result);
                       subscriber.unsubscribe();
                     }
                   });
                 });

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