Scala Scala Basics and Syntax

Question 1

Which keyword is used to declare an immutable variable in Scala?

Accepted Answer

val

Answer

In Scala, `val` declares an immutable (read-only) variable that cannot be reassigned after initialization.

Question 2

What is the output of `println(10 / 3)` in Scala?

Accepted Answer

3

Answer

Integer division in Scala truncates the decimal, so 10 / 3 yields 3.

Question 3

How do you define a function in Scala?

Accepted Answer

def foo() {}

Answer

In Scala, functions are defined using the `def` keyword followed by the function name and parameter list.

Question 4

Which of the following is a valid Scala string interpolation syntax?

Accepted Answer

s"Hello $name"

Answer

The `s` prefix enables simple string interpolation in Scala, allowing variables to be embedded directly in strings.

Question 5

What does the `Unit` type represent in Scala?

Accepted Answer

The absence of a meaningful return value

Answer

`Unit` in Scala is analogous to `void` in Java and indicates that a function does not return a meaningful value.

Scala Practice Test