Angular unsubscribe, Angular async pipe, RxJS subscribe - Avoid Memory Leaks

If you write RxJS subscribe in Angular you by default have a memory leak. In order to avoid this you need to use Angular unsubscribe. Other way is to leverage Angular async pipe. We also will look on most production way to unsubscribe by using rxjs takeUntil.
TIMESTAMPS
0:00 RxJS subscribe
1:51 Angular Unsubscribe
3:35 Angular Async pipe
4:40 Take N RxJS
6:09 Take while RxJS
6:58 Take until RxJS
9:12 Custom take until
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[@luczztem]

broo the extended class approach is genius

[@MonsterlessonsAcademy]

Thank you!

[@bizmarinainfo1808]

Excellent short and consolidated walkthrough. Thanks for posting.

[@MonsterlessonsAcademy]

Glad to hear that!

[@hamza201183]

High quality information as always. Many thanks Oleksandr!

[@MonsterlessonsAcademy]

My pleasure!

[@its_vincesanity]

This is pretty awesome! Love that's it's so easy to implement but so valuable. Thanks!

[@MonsterlessonsAcademy]

Glad you like it!

[@izacaqsha3480]

You are awesome sir, keep making videos like this !!! You are teaching a lot of newbies and experienced programmers!!

[@MonsterlessonsAcademy]

Thank you, I will

[@chinmayapandya8990]

superb explanation of all possible ways of avoiding memory leaks for RxJS subscriptions. Thank you so much ! 🙂

[@MonsterlessonsAcademy]

You're welcome!

[@lianayukhymchak5328]

Дякую! Дуже круте відео, все чітко і зрозуміло!) Thanks a lot!)

[@MonsterlessonsAcademy]

Glad to hear that!

[@tarasshevchuk8477]

Thank you ! Very useful information !

[@MonsterlessonsAcademy]

You are welcome!

[@ugochukwuumerie6378]

Legend! Thanks for the awesome content especially the custom takeUntil(), pretty useful

[@MonsterlessonsAcademy]

Glad you like them!

[@mirodz21]

amazing explanation. super helpful!

[@MonsterlessonsAcademy]

Glad it was helpful!

[@riketscience]

The last part at 09:12 is very nice indeed. I really like this kind of work. A great solution for many applications. Once again, great content my friend. 👍

[@MonsterlessonsAcademy]

Thank you very much!

[@mrlindaring]

Brilliant! Thank you.

[@MonsterlessonsAcademy]

You're very welcome!

[@rizaanjappie]

This channel is underrated.

[@MonsterlessonsAcademy]

Thank you!

[@msiyam]

Many Many Thanks to you sir, You make my day

[@MonsterlessonsAcademy]

It's my pleasure

[@ndthinh91]

Thank for your awesome content

[@MonsterlessonsAcademy]

Glad you like it!

[@valikonen]

Amazing post. Maybe you'll make more with RxJS and also with complex Directives. Thank you!

[@MonsterlessonsAcademy]

Thank you for the idea!

[@krzaqabc]

You provide very valuable content, thank you Olexander PS Olexander, consider creating new angular course but even more advanced than medium one - by saying more advanced i mean using bigger spectrum of RxJs operators, change detection strategy, NG rx, using facade pattern, and such tricks like this one with extending abstract class, strict mode, use of firebase? This is just my idea, but knowing your skills as a teacher and experienced developer it would be Very valuable and helpful for developers on any 'level', best regards and stay healthy!

[@MonsterlessonsAcademy]

Thank you for the idea. I will add it to the list of future courses!

[@imriharlev5151]

Thank you for the good content 🤩

[@MonsterlessonsAcademy]

Glad you enjoy it!

[@kirole7381]

Best and straightforward...but i just see in my navbar one of your videos.. that async pipe is broken in Angular

[@MonsterlessonsAcademy]

Yes, you are right kzbin.info/www/bejne/kGq4amCMh7OSjrcsi=WUum9t-zTDwQ078W

[@roman-tp6sd]

You re the best! Tnxx!

[@MonsterlessonsAcademy]

Thank you!

[@transforgoku]

Excellent video, I think I'm gonna stick to async pipe and avoid suscriptions, Oninit and Ondestroy altogether in my code...

[@MonsterlessonsAcademy]

Yeap. Or look into Signals if you use Angular 16

[@leiayuri]

Hi, i find this approach very interesting also. DO you might wanna do a short video about that option too. takeUntilDestroyed with destroyRef which close "Automatically" the sub.

[@MonsterlessonsAcademy]

Hi, I already did that kzbin.info/www/bejne/mpXcqX6qm7SAp7csi=iAcYmh8rOUI-w6ZX

[@danilo_teixeira]

Very nice video man, congrats! Could you make a video talking about the new operator released in Angular 16, the "takeUntilDestroyed()"

[@MonsterlessonsAcademy]

Where did you find such method. Can you give a link?

[@austinZen8800]

Thanks!

[@MonsterlessonsAcademy]

Thank you so much for your support! It means a lot to me.

[@serhiitachuk]

Hello! I love your video so much. Where is the best place to support you? On your platform or udemy (as far as I know udemy takes some commission)?

[@MonsterlessonsAcademy]

Comission is everywhere -_-. Buying my courses or subscription on the website has the smallest comission and gives you knowledge in return. monsterlessons-academy.com/courses If you don't need a course but just want to support me there is a membership on youtube channel.

[@BennyS6502]

Nice video 👍 I would just like to mention that since version 16, Angular has introduced the "takeUntilDestroyed()" operator, which solves this problem. One question, why did you decorate the parent class "Unsub" with "@Injectable()"? In your example, it is not used as a service provided via dependency injection. Thanks!

[@MonsterlessonsAcademy]

I covered takeUntilDestroyed in a separate video kzbin.info/www/bejne/mpXcqX6qm7SAp7csi=i1RHZVQud8YKES4A Yes Unsub doesn't need injectable. It's just a habbit.

[@ali.shahnawaz]

Awesome content on unsubscribe

[@MonsterlessonsAcademy]

Happy to hear that!

[@chagamajaykumarreddy1897]

amazing stuff, we need to call super right if we use this class as a common for all components ?

[@MonsterlessonsAcademy]

Yes of course

[@chagamajaykumarreddy1897]

Is this possible way of avoiding super inside constructor

[@MonsterlessonsAcademy]

@@chagamajaykumarreddy1897 no, it's how prototypes are working in js

[@fuji91]

Sorry for the dumb question, but what if I have: data$ = interval(1000); const x$ = this.data$.pipe(take(1)); x$.subscribe((data) => console.log('data', data)); Which of the observables does the take(1) operator specifically complete?

[@MonsterlessonsAcademy]

It's not dumb. x$ is a new observable based on data$. As you subscribe to x$ it has a take function

[@VasjaG]

Is it correct that we should use ReplaySubject, NOT Subject for unsubscription? After component destroyed it is possible that Subject is destroyed too, but subscription NOT. And subscription survive after destroy. But ReplaySubject can "shot" one more time after component destroy and subscription will be completed.

[@MonsterlessonsAcademy]

You can but there is no memory leak is subscribes if you use takeUntil or unsubscribe. Doesn't matter if it is subject, behaivourSubject or replaySubject.

[@letok2871]

Крутотень)

[@kazishahinDe]

how would you call abstract unsub class while your component already extends other class? in typescript you cant extend two class. do you have any thoughts about that?

[@MonsterlessonsAcademy]

You can't do that. Extend approach is not that popular in Angular at all. Typically you just inject services and use them.

[@austinZen8800]

you'll need a super() call in the component's constructor using / extending this class, otherwise TS will complain?

[@MonsterlessonsAcademy]

You are totally right. If you need to do anything in contructor you must call super.

[@rohit36910]

Premium content, useful information. Thank you

[@MonsterlessonsAcademy]

Glad it was helpful!

[@rohit36910]

Should i unsubscribe route change as well

[@MonsterlessonsAcademy]

Angular does it for us but I prefer to just unsub for every subscribe I see

[@sergiocebrian85]

I still remember several projects where the people forgot to close subscriptions...

[@MonsterlessonsAcademy]

Yeap. Happens all the time.

[@candyroll7894]

Hi, can you tell us which IDE you are using? :)

[@MonsterlessonsAcademy]

It's Vim

[@candyroll7894]

@@MonsterlessonsAcademy Okie I am little confused as I am learning angular,should I use vscode or vim? I know it is just IDE but still which has better support?

[@MonsterlessonsAcademy]

@@candyroll7894 You should use vscode and focus on learning programming and not configuring the editor which with vim will take a lot of time.

[@candyroll7894]

@@MonsterlessonsAcademy thank you 😁

[@lindermannla]

Monster! 😂

[@space-waves]

Wait what? I was sure the component is destroy when not in the view anymore and by consequence all subscribe are unsubscribed…

[@MonsterlessonsAcademy]

Destroying doesn't have anything to do with the in view or not. Also you need to unsubscribe manually.

[@manit77]

why don't we just use a promise for queries? this sounds like a potential problem in your app to troubleshoot.

[@MonsterlessonsAcademy]

It's architecture of Angular team. I didn't have any problems or need to use promises in Angular.

[@iukys3889]

I don’t feel like the video is useful at all, this can be found in angular doc and this is far from real life situation (interval really ? ..)

[@MonsterlessonsAcademy]

It's the example to see that stream was canceled.

[@mkrzyzowski]

Last one approach is nice but it does not allow to use "ngOnDestroy" in the "Postscomponent" as it is already declared in "Unsub".

[@mkrzyzowski]

but we can add "public unsubscribe(): void {" in "Unsub" and call it from "public override ngOnDestroy() {", "this.unsubscribe();" to solve it.

[@MonsterlessonsAcademy]

exactly