ReactiveCocoa

Uses the `<~` operator to bind streams of values to UI components like UILabels, enabling automatic updates and reducing imperative code, as demonstrated in the nameLabel example.

Provides signals for user interactions and a convenient API for binding actions, such as linking button presses to CocoaAction, simplifying event-driven logic.

Allows intercepting Objective-C method calls and object lifetimes as signals, making it ideal for mixed Swift-Objective-C codebases with reactive patterns.

Establishes key-value observations as composable signal producers with lifetime management, ensuring memory safety and reducing common KVO pitfalls.