Swift (iOs) MCQs with answers Page - 3

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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Q. Which of the following is a valid way to declare an array in Swift?

(A) var arr = Array<Int>()
(B) int[] arr = new int[]
(C) array arr = []
(D) arr = list()

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Q. What will this Swift code output?

Code:

let value = true
print(!value)

(A) true
(B) false
(C) nil
(D) 1

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Q. How do you define a dictionary in Swift?

(A) var dict = [String: Int]()
(B) dict = new Dictionary()
(C) dict = {String, Int}
(D) var dict = dict<String, Int>()

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Q. What will the following Swift code print?

Code:

let x = 10
let y = 20
print(x < y)

(A) true
(B) false
(C) nil
(D) 0

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Q. What is the type of a tuple declared as `let point = (2, 3)`?

(A) (Int, Int)
(B) Array<Int>
(C) Set<Int>
(D) Dictionary

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Q. How do you create a multiline string in Swift?

(A) Using triple single quotes ''' '''
(B) Using + for each line
(C) Using triple double quotes """ """
(D) Using backticks

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Q. What will this Swift code output?

Code:

let numbers = [1, 2, 3]
print(numbers.count)

(A) 3
(B) 2
(C) 1
(D) 0

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Q. Which of the following is true about Swift 'struct'?

(A) Structs are reference types
(B) Structs support inheritance
(C) Structs are value types
(D) Structs must be declared as final

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Q. Which operator is used to concatenate strings in Swift?

(A) *
(B) &
(C) +
(D) #

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Q. How do you create a range from 1 to 5 in Swift?

(A) 1..<5
(B) 1...5
(C) [1-5]
(D) {1,2,3,4,5}

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