MEAN Trivia 5

Question 1

Which Angular decorator is used to inject a service into a component?

Accepted Answer

Constructor parameter typing

Answer

Angular's dependency injection reads TypeScript constructor parameter types to inject services automatically.

Question 2

What MongoDB aggregation stage is used to filter documents, similar to a WHERE clause in SQL?

Accepted Answer

$match

Answer

$match filters documents to pass only those that meet the specified conditions to the next stage.

Question 3

What is the purpose of the `async` and `await` keywords in Node.js?

Accepted Answer

Write asynchronous code that reads like synchronous code

Answer

async/await is syntactic sugar over Promises that allows asynchronous code to be written in a synchronous style.

Question 4

Which Angular service is used to make HTTP requests to a backend API?

Accepted Answer

HttpClient

Answer

HttpClient from @angular/common/http is Angular's built-in service for making HTTP requests.

Question 5

What does the `--save-dev` flag do when running `npm install`?

Accepted Answer

Saves the package as a development-only dependency

Answer

--save-dev (or -D) saves the package under devDependencies, so it's excluded from production builds.

MEAN - Stack Development Practice Test