Chain 2 observables in RxJS

Question

***[In this context all api requests return an Observable]***

I want to chain 2 observables like this

```
data$.subscribe((data)=>{
fetchOtherData(data).subscribe((otherData)=>{
....
    })
})
```

Is this a good way to do or can we use an operator to chain these 2 observables?

Accepted Answer

Use a pipe with switchMap, concatMap or mergeMap operator is a better practice.

Answer

Yes, that's a good way to do.

Question from the Introduction to RxJS test