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

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1. What is the primary function of the `UICollectionView` class in UIKit?

Option: To display a scrollable list of items.

Option: To create custom views.

Option: To display a grid or other custom layout of items.

Option: To manage navigation between view controllers.

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2. 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)

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3. 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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4. Which concurrency pattern is most suitable for tasks that involve waiting for external events, like network requests or user input?

Option: Async/Await

Option: Actors

Option: Tasks

Option: Dispatch Queues

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5. 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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6. Which of the following is NOT a valid way to handle errors in Swift?

Option: Throwing an error using the `throw` keyword

Option: Using a `do-catch` block

Option: Returning an optional value

Option: Ignoring the error

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7. In Swift, which of the following is NOT a valid access control level?

Option: public

Option: private

Option: protected

Option: internal

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8. 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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9. 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

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10. What is the purpose of the `@UIApplicationDelegateAdaptor` property wrapper in SwiftUI?

Option: To create a delegate for a UIKit view controller

Option: To inject an environment object

Option: To adapt a SwiftUI app to use a UIApplicationDelegate

Option: To handle deep linking

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11. What does the `lazy var` keyword signify in Swift?

Option: The variable is initialized only when first accessed.

Option: The variable is a constant.

Option: The variable is optional.

Option: The variable is computed.

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

Option: enum

Option: struct

Option: class

Option: protocol

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13. What is the purpose of a "Combine Scheduler"?

Option: To schedule background tasks

Option: To manage the execution context of a publisher's work

Option: To handle network requests

Option: To store data in memory

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14. 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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15. Which of these is a dependency manager for Swift and Objective-C projects?

Option: npm

Option: pip

Option: CocoaPods

Option: Yarn

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16. What is the purpose of the `@StateObject` property wrapper in SwiftUI?

Option: To inject an object into the environment

Option: To create a binding to a state variable

Option: To create a reference object that is owned by the view and persists across updates

Option: To observe changes to an object owned by an external source

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17. Which framework is primarily used for unit testing in Swift?

Option: XCTest

Option: Quick

Option: Nimble

Option: Specta

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18. Which design pattern is commonly used to handle the navigation flow between screens in iOS apps?

Option: Singleton

Option: Observer

Option: Coordinator

Option: Factory

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19. Which of these is NOT a valid HTTP method used in RESTful APIs?

Option: GET

Option: POST

Option: PUT

Option: SEND

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20. What is the difference between a `Combine` `Publisher` and a `Subscriber`?

Option: A `Publisher` emits values, while a `Subscriber` receives them.

Option: A `Publisher` is a protocol, while a `Subscriber` is a class.

Option: A `Publisher` can have multiple subscribers, while a `Subscriber` can only subscribe to one publisher.

Option: All of the above.

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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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