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

Option: `.padding()`

Option: `.font()`

Option: `.background()`

Option: `.transform()`

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2 / 20

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 / 20

3. 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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4 / 20

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

Option: `struct`s are value types, while `class`es are reference types

Option: `struct`s are immutable, while `class`es are mutable

Option: `class`es can inherit from other classes, while `struct`s cannot

Option: All of the above

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5 / 20

5. 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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6 / 20

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 / 20

7. 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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8 / 20

8. 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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9 / 20

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

Option: enum

Option: struct

Option: class

Option: protocol

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10 / 20

10. 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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11 / 20

11. 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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12 / 20

12. Which of the following is used to define a block of code that can be passed around like a variable?

Option: Tuple

Option: Function

Option: Closure

Option: Structure

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13 / 20

13. 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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14 / 20

14. 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.

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15 / 20

15. 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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16 / 20

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 / 20

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

Option: XCTest

Option: Quick

Option: Nimble

Option: Specta

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18 / 20

18. 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

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19 / 20

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 / 20

20. 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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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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