Setting with merge option in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set data in Firestore with merge option.

Firebase

db.collection('users').doc('user1').set({ name: 'Alice' }, { [1]: true });

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

Aoverwrite

Bmerge

Cupdate

Dreplace

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'overwrite' will replace the entire document.

Using 'update' is a different method, not an option here.

The merge option allows you to update specific fields without overwriting the entire document.

2fill in blank

medium

Complete the code to merge new data into an existing Firestore document.

Firebase

db.collection('settings').doc('config').set({ theme: 'dark' }, { [1]: true });

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

Areplace

Boverwrite

Cmerge

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing 'update' method with 'merge' option.

Forgetting to pass the option as an object.

Using merge: true updates only the specified fields.

3fill in blank

hard

Fix the error in the Firestore set call to merge data correctly.

Firebase

db.collection('profiles').doc('user2').set({ age: 30 }, { [1] });

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

Atrue

Bmerge: false

Cmerge

Dmerge: true

Attempts:

3 left

💡 Hint

Common Mistakes

Passing 'merge' without a value.

Passing 'true' without key.

The option must be an object with merge: true to merge fields.

4fill in blank

hard

Fill both blanks to set data with merge option and update the 'status' field.

Firebase

db.collection('orders').doc('order1').set({ status: 'shipped' }, { [1]: [2] });

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

Amerge

Btrue

Cfalse

Doverwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'false' disables merging and overwrites data.

Using 'overwrite' is not a valid option.

Use merge: true to update only the 'status' field without overwriting the whole document.

5fill in blank

hard

Fill all three blanks to set nested data with merge option in Firestore.

Firebase

db.collection('users').doc('user3').set({ profile: { age: [1] } }, { [2]: [3] });

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

A25

Bmerge

Ctrue

Dfalse

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'false' disables merging and overwrites data.

Passing merge option incorrectly as a string.

Set the age to 25 and use merge: true to update nested fields without overwriting the whole document.