zip<R> function

EventSubscriptionBuilder<R> zip<R>(List<EventSubscriptionBuilder> events, R zipper(List events))

Zips the items emitted by the given events into a single EventHandler using the zipper function.

Interactive marble diagram

Consider using the typed version zip2 - zip9.

Example

zip(
 [
   eventManager.on<EventA>(), // emits ['a']
   eventManager.on<EventB>(), // emits ['b', 'B']
   eventManager.on<EventC>(), // emits ['c', 'C']
 ],
 (values) => values.join(' '),
).subscribeFunction(print); // prints 'a b c'

Implementation

EventSubscriptionBuilder<R> zip<R>(
  List<EventSubscriptionBuilder<dynamic>> events,
  R Function(List<dynamic> events) zipper,
) {
  if (events.isEmpty) {
    throw ArgumentError.value(
      events,
      'events',
      'Cannot be empty',
    );
  }

  final builder = _ZipEventSubscriptionBuilder<R>(
    zipper: zipper,
    events: events,
  );

  return builder;
}