Free Printable Scala

Worksheets

Scala - Syntax

Total questions: 25

Worksheet time: 14mins

Name

Class

Date

Scala is a combination of which programming paradigms?

Imperative and logic programming

Object-oriented and functional programming

Procedural and declarative programming

Scripting and markup programming

Scala programs are executed on which platform?

Java Virtual Machine (JVM)

Python Interpreter

C# Framework

Node.js Runtime

Which keyword is used to declare a constant value in Scala?

immutable

val

final

const

Which keyword is used to declare a mutable variable in Scala?

let

var

const

mutable

What is the default return type of a Scala function if not specified?

String

Unit

Void

Boolean

Which of the following is the entry point of a Scala application?

def start(args: List[String]): Int

def run(args: Array[Int]): String

def main(args: Array[String]): Unit

def execute(args: Seq[String]): Any

Scala supports type inference. This means:

Scala requires explicit type declarations for all variables.

Scala only infers types for primitive data types.

Scala cannot infer types in nested functions.

Scala can determine the type of a variable or expression automatically.

Which collection is immutable by default in Scala?

List

Array Buffer

Hash map

Array

What does List(1,2,3).head return?

List(1,2,3)

10.

What does List(1,2,3).tail return?

List(1,2,3,4)

List(1,2)

List(2,3)

List(3)

11.

Which method is used to join collection elements into a string?

join()

concat()

mkString()

toString()

12.

What is the output of println(10 + "20")?

210

Error

1020

13.

Which data type represents no meaningful value in Scala?

Unit

Void

Nothing

Null

14.

What does contains() method return?

An array of elements matching the input.

A string representation of the input.

A boolean value (true or false).

An integer value (1 or 0).

15.

Which symbol is used for single-line comments in Scala?

# comment

/* comment */

16.

Which of the following is a valid Scala List?

List[1,2,3]

List(1,2,3)

(1,2,3)

{1,2,3}

17.

Which operator is used for string interpolation?

18.

What does Set(1,1,2,3) contain?

{1, 2, 3}

{2, 3, 4}

{1, 2, 3, 4}

{1, 2}

19.

Scala source files have which extension?

.scala

.java

.kt

.py

20.

Which method checks whether an element exists in a collection?

contains or in

exists or has

check or verify

find or search

21.

Which data type is the supertype of all Scala types?

None

Unit

Nothing

Any

22.

Scala code is compiled into which format?

Java bytecode

Java source code

Python script

C# code

23.

Which of the following is NOT a Scala keyword?

def

val

function

var

24.

Scala supports (a) inference, where the compiler determines the data type automatically.

25.

In Scala, everything is treated as an (a) .

100 %

Scala - Syntax

Total questions: 25

Worksheet time: 14mins

Similar Resources on Wayground