Like ReactiveCocoa and PromiseKit RxSwift simplifies asynchronous operations, but also has the benefit of familiarity of those using Reactive Extensions with another language, and unified hot and cold observables.
Some concepts have not been implemented in a manner to make things simpler when programming with Swift, so you will want to check out the documentation for all the differences.
You can find RXSwift on Github here.
An excellent addition to Swift.
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