Swift (iOs) MCQs with answers Page - 18

Here, you will find a collection of MCQ questions on Swift (iOs). Go through these questions to enhance your preparation for upcoming examinations and interviews.

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A

Admin • 828.03K Points
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Q. What will this code print?

Code: 
let result = "swift".count
print(result)
  • (A) 4
  • (B) 5
  • (C) 6
  • (D) Error

A

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Coach

Q. What does the `mutating` keyword do in Swift?

  • (A) Allows a struct method to modify its properties
  • (B) Makes a function constant
  • (C) Prevents changes to variables
  • (D) Enables inheritance

A

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Q. What will this code print?

Code: 
let value = "123"
let number = Int(value)
print(number ?? 0)
  • (A) 123
  • (B) Optional(123)
  • (C) 0
  • (D) nil

A

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Q. Which method converts a string to uppercase in Swift?

  • (A) uppercase()
  • (B) toUpper()
  • (C) uppercased()
  • (D) capitalize()

A

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Q. What does the `@discardableResult` attribute do?

  • (A) Ignores errors in a function
  • (B) Allows a function’s return value to be unused
  • (C) Suppresses compiler warnings
  • (D) Prevents unwrapping of optionals

A

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Q. What is the purpose of `@objc` in Swift?

  • (A) Marks code for Objective-C compatibility
  • (B) Makes code run faster
  • (C) Optimizes memory
  • (D) Marks properties as optional

A

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Q. What will this code print?

Code: 
let numbers = [1, 2, 3, 4, 5]
print(numbers.dropFirst(2))
  • (A) [1, 2, 3, 4, 5]
  • (B) [3, 4, 5]
  • (C) [1, 2]
  • (D) [2, 3, 4, 5]

A

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Q. Which of these types is not a value type in Swift?

  • (A) Struct
  • (B) Enum
  • (C) Class
  • (D) Tuple

R

Ravina • 3.96K Points
Extraordinary

Q. What does the `as?` operator do in Swift?

  • (A) Performs forced type casting
  • (B) Checks type only
  • (C) Performs conditional type casting
  • (D) Declares a variable

R

Ravina • 3.96K Points
Extraordinary

Q. Which method is used to remove all elements from an array?

  • (A) remove()
  • (B) clear()
  • (C) deleteAll()
  • (D) removeAll()

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