Learn state management in Angular using NgRx: store, actions, reducers, selectors, side effects, etc. Gain hands-on experience and best practices.

Become an AngularJS Developer

This module is designed to teach you how to manage states in Angular using the powerful NgRx library.

We’ll learn the fundamentals of state management and how it can be implemented in an Angular application using NgRx. Next, we’ll learn how to use the NgRx store, actions, reducers, and selectors to manage the application states and handle complex data. We’ll also learn how to handle side effects and asynchronous operations in an Angular application.

Throughout the course, we’ll gain hands-on experience in implementing state management using interactive projects. We’ll explore best practices and design patterns for state management in Angular and how to structure the state of an application using NgRx. Additionally, we’ll learn how to write unit test cases for NgRx features.

By the end of the module, we’ll be able to implement and debug states in an Angular application. We’ll be able to create more scalable, maintainable, and testable Angular applications that can handle complex states and data.

Angular State Management

## Introduction


The purpose of using NgRx Effects is to remove side effects from the Angular components. In our `src/app/products/products.component.ts` file, we're using the `ProductsService` class to fetch product data from the server. In this lesson, we'll refactor the `ProductsComponent` to remove the side effects.

import { Component, OnInit } from '@angular/core';
import { ProductsService } from '../products.service';
import { Store } from '@ngrx/store';
import { getProductsAction } from './state/products.actions';
import { getProductsSelector } from './state/products.selectors';
import { AppState, Product } from '../app.interfaces';
@Component({
  selector: 'app-products',
  templateUrl: './products.component.html',
  styleUrls: ['./products.component.scss'],
})
export class ProductsComponent implements OnInit {
  products$ = this.store.select<Product[]>(getProductsSelector);

  constructor(
    private store: Store<AppState>, 
    private productsService: ProductsService
  ) {}

  ngOnInit() {
    this.getProducts();
  }

  getProducts() {
    this.productsService
      .getProducts()
      .subscribe((products: Product[]) => (this.store.dispatch(getProductsAction({ products }))));
  }
}


src/app/products/products.component.ts

## Removing side effects


Let's remove the `ProductsService`-related code from the `src/app/products/products.component.ts` file. We have highlighted the lines that need to be removed in the following code widget.

Click the "Run" button below and visit the home page of our project. Since we've removed the data-retrieving logic from the component, our home page no longer displays any data.

# Introduction


The purpose of using NgRx Effects is to remove side effects from the Angular components. In our `src/app/products/products.component.ts` file, we're using the `ProductsService` class to fetch product data from the server. In this lesson, we'll refactor the `ProductsComponent` to remove the side effects.

# Removing side effects


Let's remove the `ProductsService`-related code from the `src/app/products/products.component.ts` file. We have highlighted the lines that need to be removed in the following code widget.

Click the "Run" button below and visit the home page of our project. Since we've removed the data-retrieving logic from the component, our home page no longer displays any data.

Learn how to remove the side effects from the ProductsComponent.

Redux Fundamentals

NgRx Fundamentals

Implementing NgRx Fundamentals

Debugging NgRx

NgRx with TypeScript

NgRx: Advanced Concepts

NgRx Effects

Unit Testing NgRx

Implementing Shopping Cart Functionality

Appendix

Conclusion

Introduction

Removing side effects