Scala Scala Basics and Syntax 3

Question 1

What is the result of `List(1, 2, 3).head` in Scala?

Accepted Answer

1

Answer

3

Answer

2

Answer

None

Question 2

Which Scala keyword is used to extend a class?

Accepted Answer

extends

Answer

implements

Answer

inherits

Answer

super

Question 3

What is the difference between `==` and `eq` in Scala?

Accepted Answer

== checks value equality; eq checks reference equality

Answer

There is no difference

Answer

== checks reference equality; eq checks value equality

Answer

eq is not a valid operator

Question 4

How do you create an Array of integers in Scala?

Accepted Answer

Array(1, 2, 3)

Answer

Array.of(1,2,3)

Answer

int[] arr = {1,2,3}

Answer

new Array[Int](1,2,3)

Question 5

What does `lazy val` do in Scala?

Accepted Answer

Defers evaluation of a value until first access

Answer

Creates a mutable variable

Answer

Evaluates a value immediately at declaration

Answer

Creates a thread-safe singleton

Question 6

Which method converts a Scala List to an Array?

Accepted Answer

toArray

Answer

asArray

Answer

convertToArray

Answer

arrayOf