Swift (iOs) MCQs with answers Page - 16

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

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Q. Which of these is a correct use of a for-in loop?

  • (A) for 0 to 5 { print(i) }
  • (B) foreach i in 0...5 { print(i) }
  • (C) for i in 0...5 { print(i) }
  • (D) loop i = 0 to 5 { print(i) }

A

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Q. Which of these methods reverses an array in-place?

  • (A) reversed()
  • (B) reverse()
  • (C) flip()
  • (D) mirror()

A

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Q. What will be the type of `let value = (404, "Not Found")`?

  • (A) (Int, String)
  • (B) [Int: String]
  • (C) Dictionary
  • (D) Tuple

A

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Q. How do you access the number of items in a Dictionary?

  • (A) count()
  • (B) length
  • (C) size()
  • (D) count

A

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Q. Which function would you use to check if an array contains a value?

  • (A) has()
  • (B) contains()
  • (C) includes()
  • (D) exists()

A

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Q. What will this code print?

Code: 
let optionalName: String? = "Swift"
if let name = optionalName {
 print(name) }
  • (A) Swift
  • (B) Optional("Swift")
  • (C) name
  • (D) Error

A

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Q. Which Swift keyword is used to indicate a throwing function?

  • (A) throw
  • (B) throws
  • (C) try
  • (D) catch

A

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Q. What is a correct way to declare a Swift enum?

  • (A) enum Colors: String { case red, green, blue }
  • (B) enum Colors { red, green, blue }
  • (C) enum Colors [red, green, blue]
  • (D) enum Colors => red, green, blue

A

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Q. What does the `stride(from:to:by:)` function do in Swift?

  • (A) Generates a random number
  • (B) Iterates over a range with a specific step size
  • (C) Sorts an array
  • (D) Returns the largest number

A

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Q. What is the result of this code?

Code: 
let list = [1, 2, 3, 4]
print(list.filter { $0 % 2 == 0 })
  • (A) [1, 3]
  • (B) [2, 4]
  • (C) [1, 2, 3, 4]
  • (D) [0, 2]

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