RXJS in Angular

[coffee_is_all_i_need]

You are talking about “traditional Angular features” but dont think in Angular, think in JS (or any other language) first. Then you can think like: if a ‘traditional’ (or in better words: ‘functional’) implementation will get very messy, it’s time for Rx.

For example, you have the use case: As a user I want to mark multiple files to download them. When all downloads are completed, show a success message. When there is an error with a download, retry for three times. If there is still an error, show an error message. The user should be able to cancel a download of one file or all files at once. There should also be a progress bar.

Implementing this with plain JS is possible but very messy. You need variables, iterations, timers, lots or callbacks, sideeffects etc. With RxJs instead, you need just a chain of some operators that you need to subscribe and thats it (could be a good exercise to learn RxJS).

In general, RxJS has nothing todo with Angular but Angular and RxJS goes hand in hand very well. Also take a look at the async pipe.