RxJava how to intersperse a Flowable?

Asked Apr 28 '23 at 05:33

Active Apr 28 '23 at 06:57

Viewed 29 times

I'm new to rx-java, I'm comming from the akka world. In akka-streams there is a convinient intersperse function and I would like to know how to do the same on Flowable? so something like

Flowable
 .fromIterable(List("foo","bar"))
 .intersperse("[", "," ,"]")

which would output: [foo,bar]

I have a some big data streamed from a DB to convert as a JSON array and that would be super useful.

currently I found:

Flowable....
   .startWith(Flowable.just("["))
   .concatWith(Flowable.just("]"))

Don't know if it's a clean way, but now I just miss the in between comma

Edit: I have a working solution with

Flowable....
   .concatMap(str => Flowable.just(str, ",")
   .skipLast(1) 
   .startWith(Flowable.just("["))
   .concatWith(Flowable.just("]"))

But still, it seems it could be easier no?

edited Apr 28 '23 at 06:57

asked Apr 28 '23 at 05:33

Arthur Blanc

That's the simplest way of doing it. – akarnokd Apr 28 '23 at 07:46
ok thx a lot. Would it make sense to add a proper `intersperse` function to rxjava API? – Arthur Blanc Apr 28 '23 at 08:38
It is a very uncommon operator for us so no. – akarnokd Apr 28 '23 at 08:59

RxJava how to intersperse a Flowable?

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