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Many developers have yet to look into FRP (functional reactive programming) in general or observable pattern implementations like ReactiveX (reactivex.io) specifically, and they haven't seen the power and elegance it can offer to your architecture.
The pervasive inclusion of ReactiveX by popular media streaming company Netflix as well as Angular 2.0's inclusion of the library as a core dependency have helped to get ReactivX on developers' minds, however.
Watch this video and let Jeremy Foster (@codefoster) explain observables and ReactiveX in simple terms and marble diagrams. Then download the library yourself in one of the many, many languages it's been implemented in and get started with observables yourself.
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