zip4<R, A, B, C, D> function

EventSubscriptionBuilder<R> zip4<R, A, B, C, D>(EventSubscriptionBuilder<A> eventA, EventSubscriptionBuilder<B> eventB, EventSubscriptionBuilder<C> eventC, EventSubscriptionBuilder<D> eventD, R zipper(A a, B b, C c, D d,),)

Zips the values of each provided event using the zipper into a single output EventHandler when all handlers have emitted at each index.

See zip.

Implementation

EventSubscriptionBuilder<R> zip4<R, A, B, C, D>(
  EventSubscriptionBuilder<A> eventA,
  EventSubscriptionBuilder<B> eventB,
  EventSubscriptionBuilder<C> eventC,
  EventSubscriptionBuilder<D> eventD,
  R Function(A a, B b, C c, D d) zipper,
) {
  return zip(
    [eventA, eventB, eventC, eventD],
    (values) {
      final a = values[0] as A;
      final b = values[1] as B;
      final c = values[2] as C;
      final d = values[3] as D;

      return zipper(a, b, c, d);
    },
  );
}