RxJS sequence equivalent to promise.then()?

Question

I used to develop a lot with promise and now I am moving to RxJS. The doc of RxJS doesn\'t provide a very clear example on how to move from promise chain to observer sequenc

Answer 1

As far as i just found out, if you return a result in a flatMap, it converts it to an Array, even if you returned a string.

But if you return an Observable, that observable can return a string;