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. Which property wrapper is used to create a two-way binding between a view and a source of truth in SwiftUI?

Option: `@State`

Option: `@Binding`

Option: `@ObservedObject`

Option: `@EnvironmentObject`

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2. Which of the following is NOT a common state management approach in SwiftUI?

Option: @State

Option: @ObservedObject

Option: @EnvironmentObject

Option: @AppStorage

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3. 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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4. Which type of notification is triggered by the app itself, rather than being sent from a server?

Option: Push notification

Option: Local notification

Option: Silent notification

Option: Background notification

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5. 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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6. What is the difference between `let` and `var` when declaring properties in Swift?

Option: `let` declares a constant, while `var` declares a variable.

Option: `let` declares a variable, while `var` declares a constant.

Option: `let` is used for reference types, while `var` is used for value types.

Option: There is no difference; they are interchangeable.

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7. What is the purpose of the `deinit` method in a Swift class?

Option: To initialize the class

Option: To deallocate resources held by the class

Option: To handle user interactions

Option: To perform network requests

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8. 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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9. 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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10. What is the purpose of the `@Environment` property wrapper in SwiftUI?

Option: To inject values from the environment into a view.

Option: To observe changes in an object's properties.

Option: To bind a view to a state variable.

Option: To create an animation.

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

Option: enum

Option: struct

Option: class

Option: protocol

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13. 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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14. Which of the following is NOT a valid SwiftUI view modifier?

Option: `.padding()`

Option: `.font()`

Option: `.background()`

Option: `.transform()`

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15. 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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16. 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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17. What is the purpose of the `final` keyword when applied to a class in Swift?

Option: To make the class a singleton.

Option: To prevent the class from being subclassed.

Option: To mark the class as deprecated.

Option: To ensure the class conforms to a specific protocol.

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18. What is the purpose of the `URLSession` class in Swift?

Option: To create and manage network requests

Option: To parse JSON data

Option: To store data in UserDefaults

Option: To manage the app's lifecycle

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19. 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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20. What is the purpose of the `@dynamicMemberLookup` attribute in Swift?

Option: To dynamically add properties to a class at runtime

Option: To create a computed property that returns a dynamic value

Option: To provide custom subscripting behavior for a type

Option: To mark a property as optional

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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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