Alex talks about what options you have implementing async work on iOS. He starts with the lowest level of abstraction GCD and goes all the way up to PromiseKit and RxSwift.

GCD https://developer.apple.com/documentation/dispatch
NSOperations https://developer.apple.com/documentation/foundation/operation https://nshipster.com/nsoperation/
PromiseKit https://github.com/mxcl/PromiseKit
RxSwift https://github.com/ReactiveX/RxSwift http://reactivex.io/

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