Managing Application State with Angular Services

Service-based State Management: Angular Services can be used to handle state management of the app by storing and manipulating the data that wants to be shared throughout the whole app. Encapsulation is seen through the fact that there is only one instance of Services available. And the use of components can reference a common truth source.

Data Sharing: Services can synchronize states based on properties of the application and directly offer methods for components to read and write application state. You can inject the service into components to share state and functionality thus maintaining the state of the application across all components.

Event Emitter or RxJS Subjects: They can emit events through EventEmitter or Subject API when state change occurs. Components can subsequently be arranged so as to respond to the state of the application by subscribing to these events.

Using NgRx for State Management with Redux Pattern

Introduction to NgRx: NgRx being a state management library for the Angular applications, it addressed the Redux pattern. Redux is a state container that is predictable for JavaScript applications and unifies a single state of truth for a simple data process scenario.

Core Concepts:

• Store: NgRx provides a centralized store to manage application state.
• Actions: Actions are dispatched to describe state changes.
• Reducers: Reducers specify how the application state changes in response to dispatched actions.
• Effects: Effects handle side effects, such as HTTP requests or asynchronous operations.

Setup:

• Install NgRx dependencies using npm or yarn.
• Define actions, reducers, and effects to manage application state.
• Configure the NgRx store in the root module of your Angular application.

Using NgRx in Components:

• Components can dispatch actions to update the application state.
• Components can subscribe to slices of the application state to react to changes.

Benefits of NgRx:

Predictability: NgRx provides a predictable state container, making it easier to reason about application state changes.

Scalability: NgRx scales well with large applications by providing a structured way to manage state and handle complex logic.

Debugging: NgRx integrates with Redux DevTools, allowing developers to inspect and debug application state changes.