This document discusses functional reactive programming (FRP) and how it can solve problems related to consistency, entropy, responsiveness, and abstraction in user interfaces. It explains the concepts of reactive programming using streams (observables) and how FRP addresses issues like consecutive requests, optimistic updates, and separating concerns through techniques like switchMap, merge, and piping operations. While FRP provides benefits, it also has challenges like a learning curve, requiring architectural commitment, and resources are provided for further learning.