Swift Program - VIDYA VICHAR

Welcome to your Swift Program

How do you create a new instance of a class in Swift?

let instance = new ClassName()

let instance = ClassName()

let instance = create ClassName()

let instance = ClassName.create()

None

How do you create a tuple in Swift?

let tuple = 1, "Hello"

let tuple = [1, "Hello"]

let tuple = {"1": "Hello"}

let tuple = (1, "Hello")

None

How do you declare a constant in Swift?

let constantName

const constantName

var constantName

final constantName

None

What is the type of a variable that can hold either an integer or nil?

OptionalInt

Int?

Option

NullableInt

None

How do you iterate over items in an array in Swift?

for each item in array { ... }

while let item in array { ... }

for item in array { ... }

loop item in array { ... }

None

How do you declare a string in Swift?

let str = String('Hello')

let str = Hello

let str = "Hello"

let str = 'Hello'

None

What does the @objc attribute in Swift indicate?

The method or property can only be used in macOS

The method or property can be accessed from Objective-C

The method or property can only be used in iOS

The method or property can only be accessed from Swift

None

What is the file extension for Swift files?

.swf

.swift

.swiftlang

.swiftcode

None

How do you safely unwrap an optional in Swift?

if let value = optional { ... }

guard let value = optional { ... }

unwrap(optional)

let value = optional!

None

10.

How do you define an immutable variable in Swift?

immutable variable

let variable

const variable

var variable

None

11.

How do you write a single-line comment in Swift?

// This is a comment

/* This is a comment */

# This is a comment

None

12.

How do you concatenate two strings in Swift?

let result = string1 + string2

let result = string1.append(string2)

let result = concatenate(string1, string2)

let result = string1.concat(string2)

None

13.

What is the type of a Boolean variable in Swift?

Boolean

BoolType

Bool

boolean

None

14.

How do you create a range in Swift?

[1, 5]

range(1, 5)

1...5

5-Jan

None

15.

How do you handle multiple errors in a single do-catch block in Swift?

try-catch(error1, error2)

catch (error1, error2) { ... }

catch { case error1: ... case error2: ... }

catch { if error1 { ... } else if error2 { ... } }

None

16.

What is the shorthand for nil-coalescing operator in Swift?

??=

None

17.

How do you define a computed property in Swift?

var property: Int { return value }

computed property: Int { return value }

prop: Int { return value }

let property: Int { return value }

None

18.

How do you declare a type alias in Swift?

typedef NewType = ExistingType

typealias NewType = ExistingType

alias NewType = ExistingType

newtype NewType = ExistingType

None

19.

How do you remove an item from an array in Swift?

array.remove(at: index)

array.del(at: index)

array.pop(at: index)

array.delete(at: index)

None

20.

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

internal

private

open

public

None

21.

How do you convert a string to an integer in Swift?

string.intValue()

string.toInt()

Integer(string)

Int(string)

None

22.

How do you define a struct in Swift?

def struct StructName { ... }

struct { ... } StructName

structName { ... }

struct StructName { ... }

None

23.

How do you force unwrap an optional in Swift?

variable.unwrap!()

variable.unwrap()

variable!

variable?

None

24.

What is the keyword for defining a protocol in Swift?

proto

interface

delegate

protocol

None

25.

Which keyword is used to define a function in Swift?

def

func

function

method

None

26.

Which collection type in Swift can store duplicates?

Map

Set

Array

Dictionary

None

27.

How do you create an empty array in Swift?

var array = Int

var array = []

var array = Array

var array = emptyArray()

None

28.

How do you handle errors in Swift?

exception handling

try-catch

do-try-catch

error handling

None

29.

How do you create a dictionary in Swift?

let dict = (Key: Value)

let dict = [Key: Value]

let dict = [Key -> Value]

let dict = Dictionary()

None

30.

Which method is used to append an element to an array in Swift?

array.insert(element)

array.append(element)

array.push(element)

array.add(element)

None

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