Quiz | Croma Campus

Which collection type in Swift stores key-value pairs?

Array
Set
Dictionary
List

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What is the purpose of typealias in Swift?

Creates an alias for a type
Defines a new type
Creates a class alias
Defines a type method

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How do you declare an optional array in Swift?

var array: [String]?
var array: Optional<[String]>
let array: [String]?
var array: Array<String>?

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What is the correct way to use a for-in loop to iterate over an array in Swift?

for item in array { }
for (item: array) { }
foreach item in array { }
for item: array in array { }

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What is the default value of an uninitialized variable of type Int in Swift?

0
nil
1
-1

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What is the purpose of guard statement in Swift?

Error handling
Conditional checks
Function definitions
Loops

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How do you declare a generic function in Swift?

func myFunction<T>(parameter: T) {}
func myFunction<T>(parameter: T)
func myFunction(parameter: T) {}
func <T>(parameter: T) {}

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Which of the following is a valid Swift string literal?

"Hello"
Hello
"Hello
"Hello"

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How do you access a property of a class instance in Swift?

instance.property
class.property
object.property
self.property

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How do you create an immutable dictionary in Swift?

let dictionary = ["key": "value"]
var dictionary = ["key": "value"]
const dictionary = ["key": "value"]
let dictionary: [String: String] = ["key": "value"]

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Which keyword is used to define an enumeration in Swift?

enum
enumeration
enum_type
enum_class

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What does self refer to in Swift?

A method
The current instance
The superclass
A variable

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How can you handle errors in Swift?

try-catch
handle-error
try-catch-finally
do-try-catch

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Which keyword is used to define a class in Swift?

class
type
object
structure

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Which operator is used to concatenate strings in Swift?

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What keyword is used to define a constant in Swift?

var
let
const
static

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Which keyword allows a Swift class to conform to a protocol?

conforms
implements
:
conform

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How do you declare an array of strings in Swift?

var strings: [String]
var strings: Array<String>
let strings: [String]
let strings: Array<String>

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How can you call a method on an optional value safely in Swift?

Using optional chaining
Using optional unwrap
Using forced unwrap
Using try-catch

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How do you create a constant array in Swift?

let array = [1, 2, 3]
var array = [1, 2, 3]
const array = [1, 2, 3]
let array: [Int] = [1, 2, 3]

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How do you define a protocol in Swift?

protocol MyProtocol { }
define protocol MyProtocol { }
interface MyProtocol { }
protocol MyProtocol { }

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What does the static keyword do in Swift?

Creates a static property
Creates a class method
Defines a shared property
Defines a type method

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How can you specify that a Swift function takes a variable number of arguments?

Using varargs
Using variadic parameters
Using ...
Using spread

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How do you declare a variable in Swift that can hold either an integer or a string?

var myVar: Int
String
var myVar: Any
var myVar: Int

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What is the correct way to handle an optional value with a default value in Swift?

var value = optionalValue ?? 0
var value = optionalValue!
var value = optionalValue ?: 0
var value = optionalValue

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What does the defer keyword do in Swift?

Delays execution until program ends
Ensures code is executed after control flow exits
Defines a function
Changes variable values

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How do you create a tuple in Swift?

(1, "A")
[1, "A"]
{1, "A"}
(1; "A")

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How do you create a read-only property in Swift?

var property: Int { get }
let property: Int { get }
private var property: Int { get }
public var property: Int { get }

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