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. 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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3 / 20

3. 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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4 / 20

4. 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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5 / 20

5. 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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6 / 20

6. 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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7 / 20

7. 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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8 / 20

8. 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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9 / 20

9. 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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10 / 20

10. 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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11 / 20

11. 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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12 / 20

12. 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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13 / 20

13. 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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14 / 20

14. 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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15 / 20

15. 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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16 / 20

16. 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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17 / 20

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

Option: enum

Option: struct

Option: class

Option: protocol

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18 / 20

18. 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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19 / 20

19. 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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20 / 20

20. 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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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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