MEAN Angular Components and Services 2

Question 1

What is Angular's HttpClient module used for in a MEAN stack application?

Accepted Answer

Making HTTP requests to the Express backend API from Angular services

Answer

Serving HTTP responses from Angular's built-in server

Answer

Handling HTTP requests on the server side

Answer

Caching HTTP responses locally

Question 2

What is lazy loading in Angular and why is it beneficial?

Accepted Answer

Loading feature modules only when navigated to, reducing initial bundle size

Answer

Deferring image loading until they enter the viewport

Answer

Loading components only when a user scrolls to them

Answer

Caching module code for faster subsequent loads

Question 3

What is the Angular Router's `CanActivate` guard used for?

Accepted Answer

Preventing navigation to a route if a condition is not met, such as user not being authenticated

Answer

Activating animations when navigating between routes

Answer

Pre-loading route data before rendering the component

Answer

Cleaning up resources when leaving a route

Question 4

Which Angular feature allows you to define a template once and reuse it multiple times in a component?

Accepted Answer

ng-template with ngTemplateOutlet

Answer

Component inheritance

Answer

@Input with template strings

Answer

Content projection with ng-content

Question 5

What is the purpose of Angular's `Renderer2` service?

Accepted Answer

Manipulates the DOM in a platform-safe way that works in server-side rendering

Answer

Renders Angular components to PDF or images

Answer

Provides a second rendering pipeline for animations

Answer

Optimizes change detection for complex DOM operations

Question 6

What is Angular's `ng-content` directive used for?

Accepted Answer

Content projection that allows a parent to pass HTML into a child component's template

Answer

Conditionally rendering template content

Answer

Generating content from a data array

Answer

Lazy loading template sections