Best RxJava links: map, flatMap, concatMap, and more

As often happens, I have about 50 browser tabs open, and in an effort to close some of those down, these are some of the best links I found while working with RxJava a week or two ago:

• Grokking RxJava, Part 2: Operator
• RxJava Observable tranformation: concatMap() vs flatMap()
• Understanding RxJava subscribeOn and observeOn
• Grokking Reactive User Interfaces
• ReactiveX: flatmap
• RxJava: FlatMap, SwitchMap and ConcatMap