Reactor also provides operators that make it possible to accumulate data streams as collections. The most basic of these is the collectList() operator. The operator accumulates the data as a list, as shown in the following diagram:
Let's take our Fibonacci example and collect the data into a list. The collector method provides a Mono publisher that will emit a single list containing all of the published data:
public void testFibonacciCollect() { Flux<Long> fibonacciGenerator = Flux.generate( () -> Tuples.<Long, Long>of(0L, 1L), (state, sink) -> { sink.next(state.getT1()); return Tuples.of(state.getT2(), state.getT1() ...