Quiz | Croma Campus

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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What keyword is used for inheritance in Swift?

extend
inherits
superclass
:

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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 define a protocol in Swift?

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

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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 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 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 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 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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What is the output of print("Hello, \(name)") where name is a string variable?

Hello, name
Hello, (name)
Hello, name
Hello, name

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Which keyword is used to define a class in Swift?

class
type
object
structure

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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 keyword is used to define a constant in Swift?

var
let
const
static

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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 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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Which collection type in Swift is unordered?

Array
Dictionary
Set
List

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What is the result of 5 / 2 in Swift?

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Which operator is used for optional chaining in Swift?

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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 handle JSON data in Swift?

Using JSONDecoder and JSONEncoder
Using JSONParser
Using JSONSerializer
Using JSONHandler

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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 is the purpose of guard statement in Swift?

Error handling
Conditional checks
Function definitions
Loops

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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 of the following is a valid Swift comment?

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

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

private
public
internal
protected

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

conforms
implements
:
conform

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