MEAN Trivia 3

Question 1

In Mongoose, what method is used to find a single document by its _id field?

Accepted Answer

findById()

Answer

Mongoose's findById() is a shorthand for findOne({ _id: id }) and is the idiomatic way to fetch by ID.

Question 2

Which Angular module must be imported to use reactive forms?

Accepted Answer

ReactiveFormsModule

Answer

ReactiveFormsModule provides FormGroup, FormControl, and FormBuilder for reactive form handling.

Question 3

What does `npm init -y` do when setting up a new Node.js project?

Accepted Answer

Creates package.json with default values

Answer

`npm init -y` creates a package.json file with default values without prompting the user.

Question 4

In Express.js, what does `res.json()` do differently from `res.send()`?

Accepted Answer

It automatically sets Content-Type to application/json

Answer

res.json() automatically sets the Content-Type header to application/json and JSON-stringifies the object.

Question 5

Which MongoDB operator is used to match documents where a field value is in a given array?

Accepted Answer

$in

Answer

The $in operator selects documents where the field value equals any value in the specified array.

MEAN - Stack Development Practice Test