Hung Hoang

A declarative approach is a way that focuses on writing code that specifies what the application should do, rather than detailing how it should be done. For example, with the async pipe in Angular, we don’t need to write code to manually subscribe to an Observable, handle its data, and update the view. Instead, we simply specify in the template that we want the data from the Observable using the async pipe. Angular handles all the underlying processes to retrieve and display the data It's often used in reactive programming with RxJS and Angular's built-in features, such as the async pipe. export class ProductComponent { product$ = this.productService.getProduct(); constructor(private productService: ProductService) {} } The product observable will hold the product data and the async pipe in the template will automatically subscribe and unsubscribe observable <div *ngIf="product$ | async as product"> <h1>{{ product.name }}</h1> <p>{{...