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is it the same with `observeOn` as there the last one wins?

With `observeOn` you can basically go to another thread after each operation

ok, I just sorted it out in my head :slightly_smiling_face: thanks!
but what happens, if i reverse their order in the above example? I guess `a.map{ b }` is still on io, and `.map { d }` is still on computation, but where is `.map { c }` going to get executed? I would guess `observeOn` "wins", so it's computation.

nope, `.map{c}` will still be on `io` since nothing changes the thread yet, so it stays on the current thread, which is `io`