When working with RxJS in Angular, you often encounter the terms Observer and Subscriber. While they are closely related, they serve different purposes in the context of observables. This article will help you understand the difference between the two and clarify why the observer in the new Observable() constructor is typed as Subscriber.

The main difference between synchronous and asynchronous validators is how they execute and what they return. Synchronous validators are quick and run immediately, while asynchronous validators handle delayed operations like server requests.

Angular's strictly typed forms bring type safety to reactive forms, ensuring that the values and structure of forms align with TypeScript types. This feature improves developer productivity and reduces runtime errors

The FormBuilder service is a powerful tool for creating and managing reactive forms in Angular. Its concise syntax, support for dynamic forms, and advanced features like updateOn and nested groups make it an essential part of building scalable and maintainable forms.

The difference between the two approaches lies in how the FormControl instances are created and accessed. Which One to Use?