Swift skill quiz for certificate: Boost Resume and LinkedIn Profile

Enhance your career with our free Swift skill Quiz. Perfect for boosting your resume and LinkedIn profile, this comprehensive quiz covers essential Swift iOS app Development skills.

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Swift Skill Exam

1 / 20

1. What is the purpose of the `DispatchQueue.main.async` method?

Option: To execute code on a background thread

Option: To execute code after a delay

Option: To update the UI on the main thread

Option: To synchronize access to shared data

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2. What is the difference between `lazy var` and a computed property in Swift?

Option: `lazy var` is calculated only once, while a computed property is recalculated every time it's accessed

Option: `lazy var` is a property, while a computed property is a method

Option: `lazy var` can store values, while a computed property cannot

Option: There is no difference; they are interchangeable

3 / 20

3. Which of the following is NOT a valid way to unwrap an optional in Swift?

Option: Optional binding (`if let`)

Option: Forced unwrapping (`!`)

Option: Nil-coalescing operator (`??`)

Option: Implicit unwrapping (`!`, used during declaration)

4 / 20

4. What is the difference between a `class` and an `actor` in Swift?

Option: Actors are thread-safe by default, while classes are not.

Option: Actors can have mutable state, while classes cannot.

Option: Classes can inherit from other classes, while actors cannot.

Option: Both a) and c)

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5. Which protocol is used to define the layout of cells in a `UICollectionView`?

Option: `UICollectionViewDelegate`

Option: `UICollectionViewDataSource`

Option: `UICollectionViewFlowLayout`

Option: `UICollectionViewDelegateFlowLayout`

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6. What is the purpose of the `@escaping` attribute for a closure in Swift?

Option: To indicate that the closure will be executed immediately

Option: To indicate that the closure may outlive the function it is passed to

Option: To indicate that the closure can only be called once

Option: To indicate that the closure is optional

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7. What is the purpose of the `@Published` property wrapper in SwiftUI?

Option: To create a binding to a value

Option: To inject an environment object

Option: To publish changes to a property, triggering UI updates

Option: To declare a constant

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8. What is the purpose of a "PreviewProvider" in SwiftUI?

Option: To display a preview of a view in the Xcode canvas without running the app

Option: To provide default values for view properties

Option: To handle user interactions with a view

Option: To create animations

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9. Which of the following is NOT a valid way to create a Combine publisher in Swift?

Option: `Just`

Option: `Future`

Option: `Deferred`

Option: `Empty`

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10. Which framework provides APIs for interacting with the HealthKit data store in iOS?

Option: HealthKitUI

Option: HealthKit

Option: CoreMotion

Option: CloudKit

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11. What is the purpose of the `@Binding` property wrapper in SwiftUI?

Option: To create a two-way connection between a view and a source of truth

Option: To observe changes to an object's properties

Option: To inject an environment object

Option: To create an animation

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12. In Swift, which keyword is used to define an enumeration?

Option: enum

Option: struct

Option: class

Option: protocol

13 / 20

13. What is the purpose of the `DispatchQueue.global()` method?

Option: To get the main queue for UI updates.

Option: To create a serial queue for synchronous tasks.

Option: To get a global concurrent queue for background tasks.

Option: To cancel all operations in a queue.

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14. Which API allows you to fetch data from a remote server in an iOS app?

Option: CoreData

Option: UserDefaults

Option: URLSession

Option: Grand Central Dispatch

15 / 20

15. Which of the following is NOT a common way to handle asynchronous operations in Swift?

Option: Completion handlers

Option: Promises

Option: Async/Await

Option: Semaphores

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16. Which method is called when a view is about to appear on the screen in a `UIViewController`'s lifecycle?

Option: `viewDidLoad()`

Option: `viewWillAppear()`

Option: `viewDidAppear()`

Option: `viewDidLayoutSubviews()`

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17. What is the purpose of the `Codable` protocol in Swift?

Option: To make a type conform to the Equatable protocol

Option: To enable a type to be encoded and decoded to and from external representations like JSON

Option: To define a custom operator

Option: To create a new data type

18 / 20

18. What is the difference between a `NavigationLink` and a `Sheet` in SwiftUI?

Option: A `NavigationLink` pushes a new view onto the navigation stack, while a `Sheet` presents a view modally.

Option: A `NavigationLink` presents a view modally, while a `Sheet` pushes a new view onto the navigation stack.

Option: `NavigationLink` is used for navigation within a tab, while `Sheet` is used for navigation between tabs.

Option: There is no difference; they are interchangeable.

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19. What is the difference between `UserDefaults` and `Keychain` for data storage in iOS?

Option: `UserDefaults` is secure, while `Keychain` is not.

Option: `Keychain` is used for storing sensitive data, while `UserDefaults` is used for storing simple preferences.

Option: `UserDefaults` is used for storing large amounts of data, while `Keychain` is used for storing small amounts of data.

Option: There is no difference; they are interchangeable.

20 / 20

20. Which of these protocols is primarily responsible for providing data to a `UITableView` in UIKit?

Option: `UITableViewDelegate`

Option: `UITableViewDataSource`

Option: `UITableViewCellDelegate`

Option: `UITableViewCellDataSource`

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Brief About Swift

Swift is a robust and intuitive programming language created by Apple for building apps for iOS, Mac, Apple TV and Apple Watch. It’s designed to give developers more freedom than ever. Swift is easy to use and open source, so anyone with an idea can create something incredible.

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