Swift Combine Framework

"Customize handling of asynchronous events by combining event-processing operators."

"Declares that a type can transmit a sequence of values over time."

"A protocol that declares a type that can receive input from a publisher."

"A protocol indicating that an activity or action supports cancellation."

"A type of object with a publisher that emits before the object has changed."

"A protocol that defines when and how to execute a closure."