Quiz | Croma Campus

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 keyword is used to define a constant in Swift?

var
let
const
static

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What keyword is used for inheritance in Swift?

extend
inherits
superclass
:

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Which of the following is a valid Swift variable name?

1stVariable
firstVariable
first_variable
firstVariable

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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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Which operator is used for optional chaining in Swift?

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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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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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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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Which collection type in Swift stores key-value pairs?

Array
Set
Dictionary
List

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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 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 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 create a tuple in Swift?

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

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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 operator is used to concatenate strings in Swift?

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What does self refer to in Swift?

A method
The current instance
The superclass
A variable

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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 an array of strings in Swift?

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

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

conforms
implements
:
conform

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What keyword is used to handle optional values in Swift?

optional
unwrap
nil-coalescing
force-unwrap

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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 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 handle JSON data in Swift?

Using JSONDecoder and JSONEncoder
Using JSONParser
Using JSONSerializer
Using JSONHandler

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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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What is the purpose of guard statement in Swift?

Error handling
Conditional checks
Function definitions
Loops

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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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