Flux.flatMap metodu

Giriş 

Bu metodun 3 tane farklı imzası var. Bunlar şöyle

public final <R> Flux<R> flatMap(Function<? super T,? extends Publisher<? extends R>> mapper)

public final <V> Flux<V> flatMap(Function<? super T,? extends Publisher<? extends V>> mapper,
                                 int concurrency)

public final <V> Flux<V> flatMap(Function<? super T,? extends Publisher<? extends V>> mapper,
                                 int concurrency,
                                 int prefetch)  

Örnek

Şöyle yaparız

Flux<Integer> numbers = Flux.just(1, 2, 3);
Flux<String> letterFlux = numbers.flatMap(number -> 
  Flux.just("A", "B").map(letter -> number + letter));