Swift Program - VIDYA VICHAR

Welcome to your Swift Program

How do you declare a string in Swift?

let str = Hello

let str = String('Hello')

let str = 'Hello'

let str = "Hello"

None

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

string.toInt()

string.intValue()

Integer(string)

Int(string)

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

array.append(element)

array.add(element)

array.insert(element)

array.push(element)

None

How do you declare a type alias in Swift?

typedef NewType = ExistingType

typealias NewType = ExistingType

newtype NewType = ExistingType

alias NewType = ExistingType

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How do you create an empty array in Swift?

var array = emptyArray()

var array = Int

var array = Array

var array = []

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How do you concatenate two strings in Swift?

let result = string1.append(string2)

let result = concatenate(string1, string2)

let result = string1.concat(string2)

let result = string1 + string2

None

Which collection type in Swift can store duplicates?

Dictionary

Array

Set

Map

None

Which keyword is used to define a function in Swift?

def

func

function

method

None

How do you create a range in Swift?

5-Jan

range(1, 5)

1...5

[1, 5]

None

10.

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

array.remove(at: index)

array.delete(at: index)

array.pop(at: index)

array.del(at: index)

None

11.

What does the @objc attribute in Swift indicate?

The method or property can only be accessed from Swift

The method or property can only be used in iOS

The method or property can only be used in macOS

The method or property can be accessed from Objective-C

None

12.

How do you declare a constant in Swift?

let constantName

var constantName

const constantName

final constantName

None

13.

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

Option

NullableInt

OptionalInt

Int?

None

14.

How do you handle errors in Swift?

do-try-catch

try-catch

exception handling

error handling

None

15.

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

let instance = create ClassName()

let instance = ClassName.create()

let instance = ClassName()

let instance = new ClassName()

None

16.

What is the file extension for Swift files?

.swiftlang

.swiftcode

.swift

.swf

None

17.

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

/* This is a comment */

# This is a comment

// This is a comment

None

18.

What is the keyword for defining a protocol in Swift?

delegate

proto

protocol

interface

None

19.

How do you define a struct in Swift?

structName { ... }

def struct StructName { ... }

struct { ... } StructName

struct StructName { ... }

None

20.

How do you create a dictionary in Swift?

let dict = [Key -> Value]

let dict = (Key: Value)

let dict = Dictionary()

let dict = [Key: Value]

None

21.

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

private

open

public

internal

None

22.

How do you define a computed property in Swift?

computed property: Int { return value }

var property: Int { return value }

prop: Int { return value }

let property: Int { return value }

None

23.

How do you define an immutable variable in Swift?

var variable

const variable

let variable

immutable variable

None

24.

How do you force unwrap an optional in Swift?

variable?

variable!

variable.unwrap!()

variable.unwrap()

None

25.

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

??=

None

26.

How do you safely unwrap an optional in Swift?

if let value = optional { ... }

guard let value = optional { ... }

unwrap(optional)

let value = optional!

None

27.

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

28.

What is the type of a Boolean variable in Swift?

BoolType

Boolean

Bool

boolean

None

29.

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

catch (error1, error2) { ... }

try-catch(error1, error2)

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

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

None

30.

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

loop item in array { ... }

while let item in array { ... }

for item in array { ... }

for each item in array { ... }

None

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