These are chat archives for ReactiveX/RxJava
RxJava – Reactive Extensions for the JVM – a library for composing asynchronous and event-based programs using observable sequences for the Java VM.
is flatMap by default parallel ?
It depends on how you define "parallel", it can work with emissions from different threads, but by itself it doesn't schedule work on schedulers
flatMap(i - > i.observeOn(scheduler))
Observable.just()wont spawn a thread,
flatMap(e => asyncCall())certainly would run in parallel.