Increment operations in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to increment a Firestore field by 1.

Firebase

const increment = firebase.firestore.FieldValue.[1](1);

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

AincrementField

Bincrement

CincrementValue

DincrementBy

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-existent method like 'incrementBy' or 'incrementValue'.

Trying to increment without using FieldValue.

The correct method to increment a Firestore field is 'increment'.

2fill in blank

medium

Complete the code to update the 'likes' field by incrementing it by 5.

Firebase

docRef.update({ likes: firebase.firestore.FieldValue.[1](5) });

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

Aincrement

Badd

Cincrease

Dplus

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add' which is not a valid method here.

Using 'increase' or 'plus' which do not exist in Firestore API.

The 'increment' method is used to increase a numeric field by a specified value.

3fill in blank

hard

Fix the error in the code to correctly increment the 'score' field by 10.

Firebase

db.collection('games').doc('game1').update({ score: firebase.firestore.FieldValue.[1](10) });

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

Aupdate

Badd

Cincrement

Dincrease

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add' or 'increase' which are not valid Firestore methods.

Using 'update' as a method of FieldValue which is incorrect.

The correct method to increment a numeric field in Firestore is 'increment'.

4fill in blank

hard

Fill both blanks to increment 'views' by 1 and 'shares' by 2 in a Firestore document update.

Firebase

docRef.update({ views: firebase.firestore.FieldValue.[1](1), shares: firebase.firestore.FieldValue.[2](2) });

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

Aincrement

Badd

Cincrease

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using different methods like 'add' or 'increase' which are invalid.

Using 'update' which is not a FieldValue method.

Both fields should use the 'increment' method to increase their values by the specified amounts.

5fill in blank

hard

Fill all three blanks to increment 'likes' by 3, 'comments' by 4, and 'shares' by 5 in a Firestore update.

Firebase

docRef.update({ likes: firebase.firestore.FieldValue.[1](3), comments: firebase.firestore.FieldValue.[2](4), shares: firebase.firestore.FieldValue.[3](5) });

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

Aincrement

Badd

Cincrease

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add', 'increase', or 'update' which are not valid FieldValue methods.

Mixing different methods for different fields.

All three fields use the 'increment' method to increase their values by the given amounts.