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A `Publisher.collect(_:)` example.
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import CombineExt | |
let delayedIntPublishers = (0...12).map { index in | |
AnyPublisher<Int, Never>.create { subscriber in | |
print("Subscribed to \(index)") | |
DispatchQueue.main.asyncAfter(deadline: .now() + 2) { | |
subscriber.send(index) | |
subscriber.send(completion: .finished) | |
} | |
return AnyCancellable {} | |
} | |
} | |
let cancellable = delayedIntPublishers | |
.publisher | |
.flatMap { $0 } | |
.collect(5) | |
.sink(receiveValue: { batch in print(batch) }) | |
// Outputs: | |
// ``` | |
// Subscribed to 0 | |
// Subscribed to 1 | |
// Subscribed to 2 | |
// Subscribed to 3 | |
// Subscribed to 4 | |
// Subscribed to 5 | |
// Subscribed to 6 | |
// Subscribed to 7 | |
// Subscribed to 8 | |
// Subscribed to 9 | |
// Subscribed to 10 | |
// Subscribed to 11 | |
// Subscribed to 12 | |
// ``` | |
// and then two seconds later, | |
// ``` | |
// [0, 1, 2, 3, 4] | |
// [5, 6, 7, 8, 9] | |
// [10, 11, 12] | |
// ``` |
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