🔸 TL;DR

RxJava helps you model async work as streams: transform data, control concurrency, handle errors, and avoid callback hell — with a consistent, composable API.

🔸 TAKEAWAYS

▪️ Think in streams: data flows, you describe what happens to it.

▪️ Choose the right type: Single/Maybe/Completable/Observable/Flowable (Flowable when you need backpressure).

▪️ Operators are your toolbox: map / flatMap / filter / zip / combineLatest / debounce.

▪️ Concurrency is explicit: subscribeOn decides where work starts, observeOn decides where results are observed.

▪️ Errors are part of the design: use onErrorReturn / retry / timeout instead of try/catch spaghetti.

▪️ Avoid leaks: manage subscriptions with CompositeDisposable and complete streams cleanly.

🔸 S

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