Some operators support bringing together outputs from different pipelines, changing the timing of data, or filtering the data provided. Scheduler and Thread handling operators.Mixing elements from multiple publishers.Applying sequence operations to elements.publisher from a KeyValueObserving instance.Debugging pipelines with the handleEvents operator.Debugging pipelines with the print operator.Using EntwineTest to create a testable publisher and subscriber.Testing a subscriber with scheduled sends from PassthroughSubject. Testing a subscriber with a PassthroughSubject.Testing a publisher with XCTestExpectation.Using ObservableObject with SwiftUI models as a publisher source.Responding to updates from NotificationCenter.Creating a repeating publisher by wrapping a delegate based API.Merging multiple pipelines to update UI elements.Cascading multiple UI updates, including a network request.Requesting data from an alternate URL when the network is constrained.
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