Before they start coding something, most programmers begin by creating a data flow diagram to know exactly how each piece of code is supposed to work (how it should behave). If the behavior of the application is not complicated, you do not have to sketch it (although it is a good habit, even with simple things), but with more complicated behavior, it is hard to properly code such flow.

In iOS 10 we can use SFSpeechRecognizer API, which allows transcription in real-time or using pre-recorded audio files. The outcome of such transcription is not only a text, but also alternative interpretations of the audio, length of spoken words and level of accuracy of recognized words (range 0.0 - 1.0). API allows for the analysis of more than 50 languages. Using SFSpeechRecognizer API in an application is trivial, it boils down to four steps.

Clean Architecture can be approached in several ways. One solution is to use RxJava 2, and in this post we will take a close look at this approach.In the presentation layer we will use the proven standard Model View Presenter, in the domain layer we will have UseCases with a single responsibility, and in the data layer we will apply Repository Pattern. All of this will be controlled with RxJava streams.