Firebase services overview - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is Firebase in simple terms?

Firebase is a set of tools and services from Google that helps developers build apps quickly without managing servers.

beginner

Name two Firebase services used for storing data.

Firebase Realtime Database and Cloud Firestore are used to store and sync data in real time.

beginner

What does Firebase Authentication do?

It helps apps sign in users easily using email, phone, or social accounts like Google or Facebook.

beginner

How does Firebase Hosting help your app?

Firebase Hosting provides fast and secure web hosting for your app’s static files like HTML, CSS, and JavaScript.

beginner

What is Firebase Cloud Messaging used for?

It lets you send notifications and messages to users on Android, iOS, and web apps.

Which Firebase service is best for real-time syncing of app data?

A Firebase Cloud Messaging

B Firebase Hosting

C Firebase Authentication

D Firebase Realtime Database

Firebase Realtime Database is designed for syncing data instantly across devices.

What does Firebase Authentication NOT provide?

A Hosting static websites

B User sign-in management

C Social login support

D Email and password login

Hosting static websites is done by Firebase Hosting, not Authentication.

Firebase Cloud Messaging is used to:

A Store user data securely

B Send notifications to users

C Host web apps

D Authenticate users

Cloud Messaging sends notifications and messages to app users.

Which Firebase service helps you deploy your web app quickly?

A Firebase Hosting

B Firebase Cloud Functions

C Firebase Realtime Database

D Firebase Authentication

Firebase Hosting is designed for fast deployment of web apps.

Cloud Firestore differs from Realtime Database by:

A Not supporting real-time updates

B Handling user authentication

C Being a NoSQL document database

D Only working on Android

Cloud Firestore stores data as documents and collections, offering more advanced querying.

Explain the main Firebase services and their roles in app development.

Think about how each service helps build and run an app.

Describe how Firebase helps developers avoid managing servers.

Focus on the 'serverless' nature of Firebase services.

Practice

1. Which Firebase service helps you manage user sign-in and identity verification easily?

easy

A. Analytics

B. Firestore

C. Authentication

D. Hosting

Solution

1. Step 1: Understand Firebase services purpose

   Authentication is designed to handle user sign-in and identity verification.

2. Step 2: Match service to function

   Firestore is for database, Hosting is for web hosting, Analytics is for tracking usage.

3. Final Answer:

   Authentication -> Option C

4. Quick Check:

   User sign-in = Authentication [OK]

Hint: User sign-in? Think Authentication service [OK]

Common Mistakes:

• Confusing Firestore with Authentication
• Thinking Hosting manages users
• Mixing Analytics with sign-in

2. Which of the following is the correct way to initialize Firebase Hosting in your project?

easy

A. firebase init hosting

B. firebase start hosting

C. firebase deploy hosting

D. firebase create hosting

Solution

1. Step 1: Recall Firebase CLI commands

   To set up Hosting, you first initialize it with firebase init hosting.

2. Step 2: Differentiate commands

   firebase deploy hosting deploys but does not initialize; others are invalid commands.

3. Final Answer:

   firebase init hosting -> Option A

4. Quick Check:

   Initialize Hosting = firebase init hosting [OK]

Hint: Init means setup, so use 'firebase init hosting' [OK]

Common Mistakes:

• Using deploy before init
• Using non-existent commands
• Confusing start with init

3. What will the following Firebase code snippet do?

const db = firebase.firestore();
db.collection('users').add({name: 'Anna', age: 25});

medium

A. Update existing user document named Anna with age 25

B. Add a new user document with name Anna and age 25 to Firestore

C. Delete user document named Anna from Firestore

D. Retrieve all users named Anna from Firestore

Solution

1. Step 1: Understand Firestore collection and add method

   The add method creates a new document in the 'users' collection with given data.

2. Step 2: Analyze code effect

   The code adds a new user with name 'Anna' and age 25; it does not update, delete, or retrieve.

3. Final Answer:

   Add a new user document with name Anna and age 25 to Firestore -> Option B

4. Quick Check:

   add() creates new document = Add a new user document with name Anna and age 25 to Firestore [OK]

Hint: add() means create new document in Firestore [OK]

Common Mistakes:

• Thinking add updates existing data
• Confusing add with get or delete
• Assuming it retrieves data

4. You tried to deploy your Firebase Hosting but got an error saying "No public directory found." What is the most likely cause?

medium

A. You did not install Firebase CLI

B. You did not create a Firestore database

C. Your internet connection is down

D. You forgot to specify the public directory during firebase init hosting

Solution

1. Step 1: Understand the error message context

   The error "No public directory found" means Firebase cannot find the folder with website files to deploy.

2. Step 2: Identify cause related to initialization

   This usually happens if you did not set or create the public directory path during firebase init hosting.

3. Final Answer:

   You forgot to specify the public directory during firebase init hosting -> Option D

4. Quick Check:

   Missing public directory = You forgot to specify the public directory during firebase init hosting [OK]

Hint: Set public directory when initializing Hosting [OK]

Common Mistakes:

• Blaming internet connection
• Confusing Firestore with Hosting
• Not installing Firebase CLI

5. You want to track how users interact with your app and also store user profiles. Which two Firebase services should you combine?

hard

A. Firestore and Analytics

B. Hosting and Cloud Functions

C. Authentication and Hosting

D. Realtime Database and Storage

Solution

1. Step 1: Identify service for storing user profiles

   Firestore is a database service suitable for storing structured user profile data.

2. Step 2: Identify service for tracking user interactions

   Analytics tracks user behavior and app usage statistics.

3. Final Answer:

   Firestore and Analytics -> Option A

4. Quick Check:

   Store profiles + track usage = Firestore + Analytics [OK]

Hint: Store data with Firestore, track with Analytics [OK]

Common Mistakes:

• Choosing Hosting for data storage
• Confusing Realtime Database with Analytics
• Mixing Storage with tracking