Angular has evolved rapidly, introducing new reactivity models that redefine how we manage application state. For years, RxJS and NgRx were the industry standards. Today, the introduction of Angular Signals offers a simpler, more performant alternative for state reactivity.
NgRx: The Redux Pattern for Complex Systems
NgRx remains the go-to solution for large-scale enterprise applications with complex, shared state. By utilizing actions, reducers, and selectors, NgRx provides a strict, unidirectional data flow that makes debugging and testing highly predictable.
RxJS: Stream-Based Reactivity
RxJS is powerful for managing asynchronous data streams, web sockets, and event composition. While it has a steeper learning curve, it remains vital for handling complex HTTP request chains and event-driven architectures.
Angular Signals: Fine-Grained Reactivity
Introduced in recent Angular versions, Signals provide a built-in reactive primitive that tracks where state is read and updates only the necessary DOM elements. This eliminates the need for Zone.js dirty-checking in many scenarios, providing massive performance boosts out of the box.
Conclusion
Use Signals for local, component-level state and lightweight reactivity, and reserve NgRx for complex global state requirements.