Why Firebase provides mobile backend services in iOS Swift - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Firebase module in Swift.

iOS Swift

import [1]

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

AFirebase

BUIKit

CFoundation

DSwiftUI

Attempts:

3 left

💡 Hint

Common Mistakes

Importing UIKit instead of Firebase

Forgetting to import Firebase

Firebase is imported using import Firebase to access its backend services.

2fill in blank

medium

Complete the code to initialize Firebase in the AppDelegate's didFinishLaunchingWithOptions method.

iOS Swift

FirebaseApp.[1]()

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

Aconfigure

Bstart

Cinitialize

Dlaunch

Attempts:

3 left

💡 Hint

Common Mistakes

Using start() or initialize() instead of configure()

Not calling FirebaseApp.configure() at all

Firebase is initialized by calling FirebaseApp.configure() in the app launch method.

3fill in blank

hard

Fix the error in the code to save data to Firestore database.

iOS Swift

let db = Firestore.firestore()
db.collection("users").document("user1").setData([1])

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

A("name": "Alice", "age": 25)

B["name": "Alice", "age": 25]

C["name" => "Alice", "age" => 25]

D[name: "Alice", age: 25]

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets

Omitting quotes around keys

Using => instead of : for key-value pairs

Firestore expects a dictionary with keys as strings and values, so use ["name": "Alice", "age": 25].

4fill in blank

hard

Fill both blanks to read data from Firestore and print the user's name.

iOS Swift

let db = Firestore.firestore()
db.collection("users").document("user1").getDocument { (document, error) in
  if let document = document, document.exists {
    let data = document.[1]()
    print(data[[2]] as? String ?? "No name")
  }
}

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

Adata

BgetData

C"name"

DdocumentData

Attempts:

3 left

💡 Hint

Common Mistakes

Using getData() instead of data()

Not quoting the dictionary key

Use data() to get the document data dictionary, then access the "name" key.

5fill in blank

hard

Fill all three blanks to authenticate a user with email and password using Firebase Auth.

iOS Swift

Auth.auth().[1](withEmail: [2], password: [3]) { authResult, error in
  if let error = error {
    print("Error: \(error.localizedDescription)")
  } else {
    print("User signed in")
  }
}

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

AsignIn

B"[e-mail]"

C"password123"

DcreateUser

Attempts:

3 left

💡 Hint

Common Mistakes

Using createUser instead of signIn

Not passing email and password as strings

Use signIn method with email and password strings to sign in a user.