Swift (iOs) MCQs with answers Page - 19

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Q. Which type of loop is guaranteed to run at least once?

  • (A) for-in
  • (B) while
  • (C) repeat-while
  • (D) forEach

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Q. What is the type of a Swift closure that takes no parameters and returns nothing?

  • (A) () -> Void
  • (B) Void -> Void
  • (C) () -> ()
  • (D) None -> Void

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Q. What does the `Set` type ensure in Swift?

  • (A) Sorted elements
  • (B) Duplicate elements
  • (C) Ordered elements
  • (D) Unique elements

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Q. Which keyword is used to create a protocol extension?

  • (A) extend
  • (B) extension
  • (C) add
  • (D) protocol+

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Q. How is a range from 1 to 5 (inclusive) written in Swift?

  • (A) 1..<5
  • (B) 1...5
  • (C) [1...5]
  • (D) 1 to 5

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Q. Which operator is used to define nil-coalescing behavior?

  • (A) !
  • (B) ?.
  • (C) ??
  • (D) :?

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Q. What is `Codable` in Swift?

  • (A) A database protocol
  • (B) A user interface element
  • (C) A combination of Encodable and Decodable
  • (D) A custom enum

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Q. What will `print("\u{1F600}")` output?

  • (A) u{1F600}
  • (B) ☺
  • (C) ?
  • (D) Error

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Q. What is the output of `print(type(of: [1, 2, 3]))`?

  • (A) Array
  • (B) Int[]
  • (C) Array<Int>
  • (D) List<Int>

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Q. Which of the following is NOT a collection type in Swift?

  • (A) Array
  • (B) Dictionary
  • (C) Tuple
  • (D) Set

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