Quiz | Croma Campus

What keyword is used to define a constant in Swift?

var
let
const
static

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What is the default access level for properties in a Swift class?

private
public
internal
protected

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Which method is called when a Swift object is deallocated?

deinit
finalize
end
destroy

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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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Which of the following is a valid Swift variable name?

1stVariable
firstVariable
first_variable
firstVariable

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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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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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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 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 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 array of strings in Swift?

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

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Which operator is used to concatenate strings in Swift?

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How do you define an optional variable in Swift?

var myVar: Int?
var myVar: Optional<Int>
var myVar: Int!
var myVar: Int

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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 handle JSON data in Swift?

Using JSONDecoder and JSONEncoder
Using JSONParser
Using JSONSerializer
Using JSONHandler

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Which of the following is used for type casting in Swift?

as
cast
convert
type

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Which collection type in Swift stores key-value pairs?

Array
Set
Dictionary
List

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Which operator is used for optional chaining in Swift?

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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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What type of value does a Swift Bool variable hold?

Integer
String
Boolean
Array

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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 is the purpose of the override keyword in Swift?

To override a method in a subclass
To create a new method
To define a new class method
To make a method private

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How can you make a Swift function return multiple values?

Using tuples
Using arrays
Using dictionaries
Using multiple return statements

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

0
nil
1
-1

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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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How do you declare a constant in Swift that is initialized with a closure?

let constant = { return 1 }
let constant = { 1 }
var constant = { return 1 }
let constant = { 1 }

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