What types of map operators do you know in RxJava…

The map operator in RxJava has several variants, differing in their functionality for transforming data.

Main types of map operators:

map: Transforms each element of the source sequence using a specified function.

// Converts numbers to their string representations
Observable<Integer> source = Observable.just(1, 2, 3);
Observable<String> result = source.map(i -> String.valueOf(i));

flatMap: Transforms each element into a new ObservableSource, then "flattens" these into a single output sequence. The order of elements may not be preserved.

// Transforms a number into an Observable of another number
Observable<Integer> source = Observable.just(1, 2, 3);
Observable<Integer> result = source.flatMap(i -> Observable.just(i * 10));

concatMap: Similar to flatMap, but guarantees that the ObservableSources are emitted sequentially, preserving order.

// Sequentially transforms a number into an Observable of another number
Observable<Integer> source = Observable.just(1, 2, 3);
Observable<Integer> result = source.concatMap(i -> Observable.just(i * 10));

switchMap: Transforms each element into a new ObservableSource. When a new element arrives, it unsubscribes from the previous Observable and subscribes to the new one. It emits only from the "latest" Observable.

// Switches to a new Observable on each new number, cancelling previous
Observable<Integer> source = Observable.just(1, 2, 3);
Observable<Integer> result = source.switchMap(i -> Observable.just(i * 10).delay(100, TimeUnit.MILLISECONDS)); // Adds delay for demonstration

mapNotNull (in Kotlin): A special operator available with RxKotlin. It functions like map, but automatically filters out null values returned by the transformation function.
```
// Filters out nulls in Kotlin
val source = Observable.just(1, 2,  null, 4)
val result = source.mapNotNull { it?.toString() }
```

These operators provide powerful tools for data transformation depending on the desired behavior and stream management.

What types of map operators do you know in RxJava?