MEAN Stack Development 4

Question 1

What is the purpose of Angular's `HttpClientModule`?

Accepted Answer

To enable making HTTP requests to backend APIs

Answer

HttpClientModule provides the HttpClient service, which Angular applications use to communicate with REST APIs over HTTP.

Question 2

Which Mongoose method finds a single document by its `_id` field?

Accepted Answer

Model.findById()

Answer

Model.findById() is a Mongoose shorthand for Model.findOne({ _id: id }) and returns the document with the matching ID.

Question 3

In Node.js, what is the purpose of the `package.json` `scripts` field?

Accepted Answer

Defines shortcuts for running commands via npm run

Answer

The scripts field defines named command shortcuts runnable with `npm run <scriptName>`, commonly used for start, test, and build tasks.

Question 4

What Angular concept allows components to communicate from a child to a parent component?

Accepted Answer

@Output() with EventEmitter

Answer

@Output() combined with EventEmitter lets a child component emit events that the parent component can listen to and respond to.

Question 5

In MongoDB, what does the `$lookup` aggregation stage accomplish?

Accepted Answer

Performs a left outer join with another collection

Answer

$lookup performs a left outer join to another collection in the same database, enriching documents with related data.

MEAN - Stack Development Practice Test