# NgRx Fundamentals (Angular)

> Store, actions, reducers, selectors, effects, state immutability, Redux pattern, NgRx DevTools

- 24 interview questions
- Senior
- [Interview Questions: Angular](https://sharpskill.dev/en/technologies/angular/interview-questions.md)

## 1. What is NgRx Store in an Angular application?

**Answer**

NgRx Store is a Redux pattern implementation for Angular, based on RxJS. It provides a centralized container for managing application global state in a predictable and immutable way. The Store exposes an Observable that allows components to subscribe to state changes via selectors.

## 2. What is the main role of an Action in NgRx?

**Answer**

An Action in NgRx is a simple object that describes an event that occurred in the application. It must contain a 'type' property (unique string) and optionally a 'payload' with data. Actions are the only way to trigger state changes in the Store via reducers.

## 3. How to create an NgRx Action with the createAction function?

**Answer**

The createAction function allows creating typed Actions in a concise way. It takes a unique string type as first parameter and optionally properties via props<T>(). This modern approach replaces action classes and provides better type inference with TypeScript.

## 21 more questions available

- What is a Reducer in NgRx?
- Why is state immutability essential in NgRx?

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