Quiz | Croma Campus

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 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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What does the @objc attribute do in Swift?

Makes a Swift method callable from Objective-C
Defines an Objective-C class
Makes a method private
Changes the method signature

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

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

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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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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 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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How can you make a Swift function return multiple values?

Using tuples
Using arrays
Using dictionaries
Using multiple return statements

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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 of the following is a valid Swift comment?

// This is a comment
# This is a comment
/** This is a comment */

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

as
cast
convert
type

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Which keyword is used to define an enumeration in Swift?

enum
enumeration
enum_type
enum_class

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Which of the following is a valid Swift variable name?

1stVariable
firstVariable
first_variable
firstVariable

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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 method is called when a Swift object is deallocated?

deinit
finalize
end
destroy

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How do you create a tuple in Swift?

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

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What type of value does a Swift Bool variable hold?

Integer
String
Boolean
Array

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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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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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How do you define a computed property in Swift?

var property: Int { get { return 0 } }
let property: Int { get { return 0 } }
var property: Int { }
computed var property: Int { get { return 0 } }

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How do you declare a function in Swift?

func myFunction() {}
function myFunction() {}
declare myFunction() {}
def myFunction() {}

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What keyword is used to handle optional values in Swift?

optional
unwrap
nil-coalescing
force-unwrap

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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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How do you handle JSON data in Swift?

Using JSONDecoder and JSONEncoder
Using JSONParser
Using JSONSerializer
Using JSONHandler

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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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