Which tool for working with data streams provides a more abstract level of multithreading management?

In iOS, for working with data streams and managing multithreading at a more abstract level, Combine is often used — a framework from Apple for reactive programming. It allows working with asynchronous data streams, combining them, transforming, and processing events, hiding low-level multithreading details.

An example of using Combine to subscribe to a data stream:

import Combine

let publisher = Just("Hello, Combine!")

let subscription = publisher.sink { value in
    print(value)
}

Thus, Combine provides a more declarative and convenient way to work with asynchrony and data streams compared to traditional tools like GCD or OperationQueue.