ObjectId and how it is generated in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new ObjectId in MongoDB.

MongoDB

const id = new [1]();

Drag options to blanks, or click blank then click option'

AMongoId

BObject

CIdObject

DObjectId

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Object' instead of 'ObjectId' will not create a MongoDB ID.

Misspelling the constructor name causes errors.

The ObjectId is the correct constructor to create a new unique identifier in MongoDB.

2fill in blank

medium

Complete the code to extract the timestamp from an ObjectId.

MongoDB

const timestamp = id.[1]();

Drag options to blanks, or click blank then click option'

AtoDate

Btimestamp

CgetTimestamp

DgetTime

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'toDate' which is not a valid method.

Confusing 'timestamp' property with a method.

The getTimestamp() method returns the ObjectId's timestamp part as a JavaScript Date object.

3fill in blank

hard

Fix the error in the code to create an ObjectId from a hex string.

MongoDB

const id = new ObjectId([1]);

Drag options to blanks, or click blank then click option'

A"1234567890abcdef12345678"

B'1234567890abcdef12345678'

CObjectId("1234567890abcdef12345678")

D1234567890abcdef12345678

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the hex string without quotes causes a ReferenceError.

Using ObjectId() inside new ObjectId() is incorrect.

The hex string must be passed as a string literal with quotes to the ObjectId constructor.

4fill in blank

hard

Fill both blanks to create an ObjectId and get its timestamp as a Date.

MongoDB

const id = new [1]();
const time = id.[2]();

Drag options to blanks, or click blank then click option'

AObjectId

BtoDate

CgetTimestamp

DIdObject

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong constructor names.

Using non-existent methods like toDate.

Use ObjectId to create the ID and getTimestamp() to get the timestamp as a Date.

5fill in blank

hard

Fill all three blanks to create an ObjectId from a hex string, convert it to a Date, and print it.

MongoDB

const id = new [1]([2]);
const date = id.[3]();
console.log(date);

Drag options to blanks, or click blank then click option'

AObjectId

B"507f1f77bcf86cd799439011"

CtoDate

DgetTimestamp

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the hex string without quotes.

Using 'toDate' which is not a valid method.

Misspelling 'ObjectId' or 'getTimestamp'.

Create the ObjectId with the hex string in quotes, then use getTimestamp() to get the timestamp as a Date.