Authentication trigger functions in Firebase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a Firebase Authentication trigger for user creation.

Firebase

exports.userCreated = functions.auth.user().[1]((user) => {
  console.log('User created:', user.uid);
});

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

AonWrite

BonDelete

ConCreate

DonUpdate

Attempts:

3 left

💡 Hint

Common Mistakes

Using onDelete instead of onCreate triggers on user deletion.

Using onUpdate triggers on user data changes, not creation.

The onCreate method triggers the function when a new user is created.

2fill in blank

medium

Complete the code to define a Firebase Authentication trigger for user deletion.

Firebase

exports.userDeleted = functions.auth.user().[1]((user) => {
  console.log('User deleted:', user.uid);
});

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

AonDelete

BonCreate

ConUpdate

DonWrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using onCreate instead of onDelete triggers on user creation.

Using onUpdate triggers on user data changes, not deletion.

The onDelete method triggers the function when a user is deleted.

3fill in blank

hard

Fix the error in the code to correctly trigger on user creation.

Firebase

exports.newUser = functions.auth.user().[1]((user) => {
  console.log('New user ID:', user.uid);
});

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

AonCreate

BonUpdate

ConDelete

DonWrite

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing onCreate with onDelete or onUpdate triggers.

Using onWrite which is not a valid auth trigger.

The correct trigger for user creation is onCreate. Using onDelete or others will not trigger on creation.

4fill in blank

hard

Fill both blanks to log the user's email and UID when a user is deleted.

Firebase

exports.logDeletedUser = functions.auth.user().[1]((user) => {
  console.log('Deleted user email:', user.[2]);
});

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

AonDelete

BonCreate

Cemail

Duid

Attempts:

3 left

💡 Hint

Common Mistakes

Using onCreate instead of onDelete for deletion triggers.

Accessing user.uid instead of user.email when email is needed.

The trigger onDelete runs when a user is deleted. The user's email is accessed with user.email.

5fill in blank

hard

Fill all three blanks to create a trigger that logs the user's UID, email, and creation time when a user is created.

Firebase

exports.logNewUser = functions.auth.user().[1]((user) => {
  console.log('User ID:', user.[2]);
  console.log('Email:', user.[3]);
  console.log('Created at:', user.metadata.creationTime);
});

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

AonCreate

Buid

Cemail

DonDelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using onDelete instead of onCreate for creation triggers.

Mixing up user.uid and user.email properties.

The trigger onCreate runs when a user is created. The user's UID and email are accessed with user.uid and user.email.