combine4<A, B, C, D, R> method

ForkJoinStream<dynamic, R> combine4 <A, B, C, D, R>(
  1. Stream<A> streamA,
  2. Stream<B> streamB,
  3. Stream<C> streamC,
  4. Stream<D> streamD,
  5. R combiner(
    1. A a,
    2. B b,
    3. C c,
    4. D d
    )
)

Constructs a Stream that awaits the last values the provided Streams, then calls the combiner to emit an event of type R. After this event, the Stream closes.

Implementation

static ForkJoinStream<dynamic, R> combine4<A, B, C, D, R>(
  Stream<A> streamA,
  Stream<B> streamB,
  Stream<C> streamC,
  Stream<D> streamD,
  R Function(A a, B b, C c, D d) combiner,
) =>
    ForkJoinStream<dynamic, R>(
      [streamA, streamB, streamC, streamD],
      (List<dynamic> values) {
        return combiner(
          values[0] as A,
          values[1] as B,
          values[2] as C,
          values[3] as D,
        );
      },
    );