Scala Program - VIDYA VICHAR

Welcome to your Scala Program

How do you define a case class in Scala?

val class ClassName(parameters)

def class ClassName(parameters)

case class ClassName(parameters)

create class ClassName(parameters)

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Which method is used to filter elements in a list in Scala?

find()

where()

filter()

select()

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Which method is used to access elements in a tuple in Scala?

get1, get2, get3

item1, item2, item3

_1, _2, _3

first, second, third

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Which method is used to check if a value exists in a list in Scala?

has()

contains()

exists()

in()

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How do you loop over a range of numbers in Scala?

for (i in 1 to 10) { ... }

for (i <- 1 to 10) { ... }

while (i <= 10) { ... }

foreach (i <- 1 to 10) { ... }

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How do you define a singleton object in Scala?

class ObjectName

object ObjectName

static ObjectName

singleton ObjectName

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Which method is used to print output in Scala?

printline()

write()

output()

println()

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Which method is used to retrieve a value from a map in Scala?

find()

retrieve()

apply()

get()

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How do you define a trait in Scala?

interface TraitName

trait = TraitName

abstract TraitName

trait TraitName

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10.

How do you handle exceptions in Scala?

try { ... } except { ... }

begin { ... } catch { ... }

exception { ... }

try { ... } catch { ... }

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11.

What is the file extension for Scala source files?

.sc

.scala

.scal

.scalaFile

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12.

Which method is used to check the length of a string in Scala?

len

count

size

length

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13.

How do you create a list in Scala?

var myList = [1, 2, 3]

val myList = List(1, 2, 3)

val myList = Array(1, 2, 3)

create myList = [1, 2, 3]

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14.

How do you concatenate strings in Scala?

string1 + string2

concatenate(string1, string2)

string1 ++ string2

string1.concat(string2)

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15.

Which keyword is used to create a subclass in Scala?

subclass

extends

extendsClass

inherits

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16.

How do you define an immutable list in Scala?

val myList = Array(1, 2, 3)

var myList = List(1, 2, 3)

val myList = List(1, 2, 3)

def myList = List(1, 2, 3)

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17.

How do you create a range in Scala?

new range(1, 10)

val range = range(1, 10)

val range = 1 to 10

create range = 1 to 10

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18.

How do you import a package in Scala?

import packageName

require packageName

use packageName

include packageName

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19.

How do you check for null values in Scala?

if (value equals null)

if (value == None)

if (value is null)

if (value == null)

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20.

How do you define a variable in Scala?

def variableName = value

var variableName = value

value variableName = value

let variableName = value

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21.

How do you create a function in Scala?

new functionName(parameters): ReturnType = { ... }

function functionName(parameters): ReturnType { ... }

create functionName(parameters): ReturnType { ... }

def functionName(parameters): ReturnType = { ... }

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22.

How do you define an anonymous function in Scala?

def (parameters) = { ... }

(parameters) => { ... }

function(parameters) { ... }

create (parameters) => { ... }

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23.

How do you create an instance of a class in Scala?

var obj = new ClassName()

def obj = new ClassName()

create obj = new ClassName()

val obj = new ClassName()

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24.

What is the method to check if a map contains a key in Scala?

isDefinedAt()

hasKey()

contains()

findKey()

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25.

How do you define a map in Scala?

var myMap = {"key1": "value1", "key2": "value2"}

def myMap = ["key1": "value1", "key2": "value2"]

create myMap = ("key1" -> "value1", "key2" -> "value2")

val myMap = Map("key1" -> "value1", "key2" -> "value2")

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26.

How do you define a lazy value in Scala?

def valueName = value

value lazy valueName = value

lazy val valueName = value

val valueName = lazy value

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27.

How do you create a tuple in Scala?

val myTuple = Tuple(1, "Scala", true)

val myTuple = [1, "Scala", true]

val myTuple = (1, "Scala", true)

create myTuple = (1, "Scala", true)

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28.

How do you define a constant value in Scala?

var constantName = value

val constantName = value

final constantName = value

const constantName = value

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29.

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

Integer.parse()

parseInt()

convertToInt()

toInt()

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30.

What is the method to sort a list in Scala?

order()

sort()

sorted()

sortList()

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