Functional Reactive Programming

This lecture introduces the concept of functional reactive programming, contrasting it with the traditional observer pattern. The instructor explains how signals, represented as functions that change over time, can simplify complex observer hierarchies by automatically updating values based on dependencies. Through examples with bank accounts, the lecture demonstrates how signals can replace imperative event handling with a functional approach, enhancing clarity and reducing the risk of errors. The instructor also discusses the limitations of using signals, such as the inability to directly update them, and highlights the benefits of functional reactive programming in building clean and functional observer structures.