FAQs

Angular services build data services because they operate as singletons, centralizing logic for Angular RESTful API communication. This separation of considerations keeps components clean and focused on UI, while making data fetching and manipulation logic reusable and testable across the application.

The HttpClient module is Angular's built-in service for making HTTP requests to Angular RESTful API endpoints. It streamlines tasks like GET, POST, PUT, and DELETE requests, providing an efficient way to fetch and send data.

The approach is consistent across all Angular versions. To update the value of a control, use setValue(), like this: myControl.setValue('new value');. If you are updating specific fields within a form group, patchValue() is a flexible choice. It enables partial updates without requiring all controls to be determined, which can contribute to Angular reactive forms performance optimization.

To change the value of a form control programmatically, you can use the setValue() method. This method not only updates the control’s value but also adjusts its validation status and state, such as marking it as touched or dirty. This process is a crucial aspect of working with Reactive Forms in Angular.

To reset a reactive form and return it to its initial state, use the reset() method on the FormGroup. This resets form fields to their default values (or to null if no defaults were set) and clears any validation states, sticking to Angular reactive forms best practices.

When considering which is better—Template-Driven Forms or Reactive Forms—it depends on the complexity of the application. Template-driven forms are easier to set up for simple scenarios. On the other hand, Reactive Forms offer greater flexibility, stronger validation logic (which is essential for Angular form validation), and are easier to test, making them the preferred choice for Angular dynamic reactive forms.

There are two primary form-handling techniques available in Angular: Reactive Forms (also known as model-driven forms) and Template-driven forms. Each method provides a different structure for creating and validating forms, accommodating various levels of complexity and control.

Tools include Angular DevTools, Lighthouse, Webpack Bundle Analyzer, and Chrome DevTools for analyzing runtime performance and determining bottlenecks.

You can minimize bundle size by enabling production mode, using Angular CLI optimizations, leveraging tree-shaking, and eliminating unused third-party dependencies.

Key practices include using lazy loading, change detection strategy optimization, ahead-of-time (AOT) compilation, tree-shaking, and efficient use of Angular service workers.