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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