Batch limits and best practices in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a batch write in Firebase.

Firebase

const batch = db.[1]();

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AwriteBatch

Bbatch

CstartBatch

DbeginBatch

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'startBatch' or 'beginBatch' which do not exist.

Using 'batch' directly without 'writeBatch()'.

In Firebase, writeBatch() is used to create a batch write object.

2fill in blank

medium

Complete the code to commit the batch write.

Firebase

await batch.[1]();

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Aapply

Bcommit

Csend

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'execute' or 'send' which are not Firebase batch methods.

Forgetting to await the commit.

The commit() method sends all the writes in the batch to the database.

3fill in blank

hard

Fix the error in the code to add a document write to the batch.

Firebase

batch.set(docRef, [1]);

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Aname = 'Alice'

B['name', 'Alice']

C'name: Alice'

D{ name: 'Alice' }

Attempts:

3 left

💡 Hint

Common Mistakes

Passing data as a string or array instead of an object.

Using assignment syntax inside the data parameter.

The data must be an object with key-value pairs, like { name: 'Alice' }.

4fill in blank

hard

Fill both blanks to limit batch size and handle errors.

Firebase

if (batchSize [1] MAX_BATCH_SIZE) {
  await batch.[2]();
  batch = db.writeBatch();
  batchSize = 0;
}

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A>=

Bcommit

C<=

Dexecute

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<=' instead of '>=' for the size check.

Using 'execute()' which is not a Firebase batch method.

Check if batch size is greater or equal to max, then commit the batch.

5fill in blank

hard

Fill all three blanks to create a safe batch write loop.

Firebase

for (const item of items) {
  const docRef = db.collection('users').doc(item.id);
  batch.[1](docRef, item.data);
  batchSize [2] 1;
  if (batchSize [3] MAX_BATCH_SIZE) {
    await batch.commit();
    batch = db.writeBatch();
    batchSize = 0;
  }
}
await batch.commit();

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Aset

B+=

C>=

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'update' instead of 'set' which may fail if document does not exist.

Using '=' instead of '+=' to increment batchSize.

Using '<=' instead of '>=' in the batch size check.

Use set to add writes, increment batchSize with +=, and check if batchSize is greater or equal to max.