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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 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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What does self refer to in Swift?

A method
The current instance
The superclass
A variable

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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 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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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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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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What is the result of 5 / 2 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 keyword is used to define a class in Swift?

class
type
object
structure

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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 an optional array in Swift?

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

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How do you declare a struct in Swift?

struct MyStruct { }
struct MyStruct
structure MyStruct { }
class MyStruct { }

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

conforms
implements
:
conform

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

as
cast
convert
type

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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 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 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 for optional chaining in Swift?

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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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How can you handle errors in Swift?

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

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What keyword is used to handle optional values in Swift?

optional
unwrap
nil-coalescing
force-unwrap

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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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Which collection type in Swift stores key-value pairs?

Array
Set
Dictionary
List

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Which operator is used to concatenate strings in Swift?

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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 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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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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