Batch writes in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a batch write instance.

Firebase

const batch = [1](db);

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AbatchWrite

BwriteBatch

Cbatch

DcreateBatch

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'batchWrite()' instead of 'writeBatch()'.

Trying to call 'batch()' directly on the database.

The writeBatch() method creates a new batch write instance in Firebase.

2fill in blank

medium

Complete the code to add a set operation to the batch.

Firebase

batch.[1](docRef, { name: 'Alice' });

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Awrite

Badd

Cupdate

Dset

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'add()' which is for collections, not batch writes.

Using 'update()' which requires the document to exist.

The set() method adds a set operation to the batch to write data to a document.

3fill in blank

hard

Fix the error in the code to commit the batch.

Firebase

await batch.[1]();

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Acommit

Brun

CcommitBatch

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'execute()' which does not exist on batch.

Using 'commitBatch()' which is not a method.

The commit() method sends all the batch operations to Firestore.

4fill in blank

hard

Fill both blanks to add a delete operation and then commit the batch.

Firebase

batch.[1](docRef);
await batch.[2]();

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Adelete

Bcommit

Cremove

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'remove()' which is not a batch method.

Using 'execute()' instead of 'commit()'.

Use delete() to add a delete operation and commit() to send the batch.

5fill in blank

hard

Fill all three blanks to update a document, add a set operation, and commit the batch.

Firebase

batch.[1](docRef, { age: 30 });
batch.[2](docRef2, { name: 'Bob' });
await batch.[3]();

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Aupdate

Bset

Ccommit

Dwrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'write()' which is not a batch method.

Mixing up 'set()' and 'update()' methods.

Use update() to change fields, set() to write data, and commit() to send the batch.