Categories: angular, typescript, rxjs

angular rxjs mergeMap/flatMap instead of multiple pipe/subscribe

1 answer

Below is an example of code. Show me please an example, how this code can be improved using features like mergeMap/combine observables.

ngOnInit() { this.route.params   .pipe(takeUntil(this.destroy$))   .subscribe((params: any) => {     this.getRound(       .pipe(takeUntil(this.destroy$))       .subscribe((round: any) => {         this.round = round;         this.getStats(, round.required_tickets)           .pipe(takeUntil(this.destroy$))           .subscribe((stats: any) => {             this.stats = stats;           });       });   }); 


All answers to this question, which has the identifier 60844678

The best answer:

You can try the code below

ngOnInit() {     this.route.params         .pipe(             takeUntil(this.destroy$),             switchMap((params: any) => {                 this.params = params                 return this.getRound(             }),             switchMap((round: any) => {                 this.round = round;                 return this.getStats(, round.required_tickets)             })         )         .subscribe((stats: any) => {             this.stats = stats;         }); } 

Plus, I would definitely not use any as types

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