$inc operator for incrementing in MongoDB - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to increment the field 'score' by 1 in a MongoDB update.

MongoDB

db.collection.updateOne({ _id: 1 }, { [1]: { score: 1 } })

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

A$set

B$inc

C$push

D$addToSet

Attempts:

3 left

💡 Hint

Common Mistakes

Using $set instead of $inc will replace the value instead of incrementing.

Using $push or $addToSet are for arrays, not numbers.

The $inc operator increments the value of a field by the specified amount.

2fill in blank

medium

Complete the code to increment the 'views' field by 5 in a MongoDB update.

MongoDB

db.collection.updateOne({ _id: 2 }, { [1]: { views: 5 } })

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

A$inc

B$min

C$mul

D$set

Attempts:

3 left

💡 Hint

Common Mistakes

Using $set will overwrite the value instead of incrementing.

Using $mul multiplies the value, not increments.

$inc adds the specified number to the current value of the field.

3fill in blank

hard

Fix the error in the update code to increment 'likes' by 3.

MongoDB

db.collection.updateOne({ _id: 3 }, { $inc: { likes: [1] } })

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

A'3'

B-3

C3

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Putting the number in quotes makes it a string, which is invalid.

Using true is not a number and causes an error.

The increment value must be a number, not a string or boolean.

4fill in blank

hard

Fill both blanks to increment 'count' by 2 and 'score' by 10 in one update.

MongoDB

db.collection.updateOne({ _id: 4 }, { [1]: { count: 2, [2]: 10 } })

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

A$inc

B$set

Cscore

D$mul

Attempts:

3 left

💡 Hint

Common Mistakes

Using $set will overwrite values instead of incrementing.

Using $mul multiplies values, not increments.

Use $inc to increment fields. The second blank is the field name 'score'.

5fill in blank

hard

Fill all three blanks to increment 'likes' by 1, 'views' by 5, and 'shares' by 2 in one update.

MongoDB

db.collection.updateOne({ _id: 5 }, { [1]: { likes: [2], views: [3], shares: 2 } })

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

A$set

B$inc

C1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using $set will overwrite values instead of incrementing.

Putting numbers in quotes makes them strings, which is invalid.

Use $inc to increment fields. The values 1 and 5 are the amounts to add to 'likes' and 'views'.