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 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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2. 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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3. 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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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. 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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6. 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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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. What is the purpose of the `@Environment` property wrapper in SwiftUI?

Option: To observe changes to an object's properties

Option: To access system-wide settings and preferences within a SwiftUI view

Option: To inject dependencies into a SwiftUI view

Option: To create animations

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9. 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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10. 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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11. In Swift, which keyword is used to define an enumeration?

Option: enum

Option: struct

Option: class

Option: protocol

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12. 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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13. 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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14. 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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15. 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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16. 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

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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. 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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19. 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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20. 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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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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