ReactiveCocoa (RAC) is a Swift framework inspired by Functional Reactive Programming. It provides APIs for composing and transforming streams of values.

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ReactiveCocoa is a functional reactive programming (FRP) framework developed by GitHub, primarily Justin Spahr-Summers and Josh Abernathy. FRP, for its part, is a specific way of writing and architecting software that creates a malleable abstraction for timelines; RAC implements one version of it for iOS and OS X.