What principles does NGRX operate on? What does this mechanism consist of, and how does it work?

NGRX is a library for state management in Angular applications, based on the Redux pattern and reactive programming principles.

Main principles and components of NGRX:

• Store — a centralized storage for application state.
• Actions — objects describing events that change the state.
• Reducers — pure functions that take the current state and an action, returning a new state.
• Effects — for handling side effects (e.g., asynchronous requests), react to actions and can dispatch new actions.
• Selectors — functions for selecting and transforming data from the Store.

Working mechanism:

1. A component or service dispatches an action.
2. The reducer receives the action and the current state, returning a new state.
3. The Store updates the state and notifies subscribers.
4. Effects listen to actions, perform side effects, and can dispatch new actions.

Thus, NGRX provides predictable state management through event streams and reactive patterns.