Refined Swift Test - 72+ MCQs: Swift Programming Language Quiz: Test Your Swift Skills

1. Explain Swift's 'associatedtype' in protocols.

A keyword for defining Swift functions in protocols

A mechanism for specifying the type of an associated value in Swift

An alternative syntax for defining Swift properties

A way to declare global constants in Swift

2. How can you achieve thread safety in Swift?

By using global variables

By defining multiple classes

Through the use of locks and queues

Swift does not support thread safety

3. In Swift, how do you create an empty array of integers?

var myArray: [Int]

array myArray = []

let myArray = [Int]

emptyArray myArray: Int[]

4. What is the purpose of the 'unowned' keyword in Swift?

To declare a constant

To define an unwrapped optional

To prevent strong reference cycles

To enforce immutability

5. What is the correct way to check if two strings are not equal in Swift?

string1 <> string2

string1 != string2

string1 ~= string2

string1 .notEqual(string2)

6. What is the correct syntax for declaring a function in Swift?

function myFunction() { }

def myFunction() { }

func myFunction() { }

sub myFunction() { }

7. In Swift, what is the purpose of the 'while' loop?

To repeat a block of code a specific number of times

To iterate over elements in an array

To make decisions based on conditions

To create an infinite loop

8. Which Swift keyword is used to start a loop?

start

loop

begin

for

9. Which Swift keyword is used for creating a loop?

for

loop

repeat

cycle

10. What is the purpose of the 'extension' keyword in Swift?

To extend the size of a data type

To add new functionality to an existing type

To create a new class

To override a base class method

11. Explain the concept of Swift's 'Set' type.

A way to represent a collection of unique, unordered values

A mechanism for defining custom attributes in Swift

A feature for writing concurrent code in Swift

Swift does not have a 'Set' type

12. How does Swift handle multiple return values from a function?

Through the use of tuples

By using global variables

Swift does not support multiple return values

By defining multiple functions

13. Explain the concept of Swift's 'inout' parameter.

A parameter indicating input in Swift functions

A keyword for defining class inheritance in Swift

A way to pass a value by reference to a function in Swift

Swift does not have an 'inout' parameter

14. How does Swift handle memory management?

Swift relies on manual memory management

Swift uses automatic reference counting (ARC)

Swift requires explicit deallocation

Swift uses garbage collection

15. What is the purpose of Swift's 'defer' statement?

To declare a Swift function

To postpone the execution of a block of code until the end of the current scope

To implement error handling in Swift

To create a global constant in Swift

16. In Swift, how do you use a closure to sort an array of integers in ascending order?

array.sort { $1 > $0 }

array.sort { $0 < $1 }

array.sort { $0 > $1 }

array.sort { $1 < $0 }

17. What is the correct syntax for an 'if-else' statement in Swift?

if condition { } else { }

if { } else { }

if (condition) { } else { }

if-else condition { }

18. What is the purpose of the Swift 'enum' type?

To define a set of related values

To declare a constant in Swift

To represent a single value

Swift does not have an 'enum' type

19. In Swift, how do you create a comment that spans multiple lines?

// This is a comment

# This is a comment

/* This is a comment */

' This is a comment

20. What is the purpose of the 'enum' keyword in Swift?

To define a class

To represent an enumeration

To create a function

To declare a protocol

Swift MCQ Test 4