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This post lists some subjective questions and answers related to Decorators in Angular. This collection contains some potential interview questions that may be helpful if you are preparing for a Frontend Engineering job interview specific to Angular framework. Check out Angular Interview Series – Topic Wise Q&A.
1. What is a decorator in Angular?
A decorator is a special type of function that modifies a class or its members (methods, properties) and provides metadata. They are used to configure Angular classes.
2. What are the commonly used decorators in Angular?
Commonly used decorators include:
@Component()@Directive()@Injectable()@NgModule()@Pipe()
3. What does the @Component() decorator do?
The @Component() decorator marks a class as an Angular component and provides metadata such as the component’s selector, template, and styles.
4 What is the purpose of the @Injectable() decorator?
The @Injectable() decorator marks a class as a service that can be injected into components or other services, allowing for dependency injection.
5. What does the @NgModule() decorator do?
The @NgModule() decorator defines an Angular module, providing metadata like declarations, imports, exports, and providers.
6 How does the @Directive() decorator work?
The @Directive() decorator defines a custom directive and specifies metadata, such as the selector that identifies the directive in templates.
7. What is the use of the @Input() decorator?
The @Input() decorator allows a parent component to pass data to a child component through its property binding.
8. What is the purpose of the @Output() decorator?
The @Output() decorator allows a child component to emit events to a parent component, enabling communication between them.
9. What is the role of the @Pipe() decorator?
The @Pipe() decorator marks a class as a custom pipe, allowing it to transform data in templates, e.g., for formatting.
10. Can you create your own custom decorators in Angular?
Yes, we can create our own custom decorators in Angular to add functionality or metadata to classes, methods, or properties.