These are the slides from my MobiDevDay 2013 talk on ReactiveCocoa.
ReactiveCocoa (RAC) is an Objective-C framework for Functional Reactive Programming. It builds off of Cocoa's own key-value observing mechanism to provide a high-level, declarative API for composing operations on streams of data, state, and asynchronous tasks. What does all of that mean? We'll find out as we explore RAC's potential for helping us better reason about the creation of our apps.
Also included in the Declarative Programming section is https://github.com/mneorr/ObjectiveSugar