Scala Scala Basics and Syntax 2

Question 1

What is the correct way to define a Scala object (singleton)?

Accepted Answer

object MyObject

Answer

class MyObject

Answer

singleton MyObject

Answer

static class MyObject

Question 2

Which collection is immutable by default in Scala?

Accepted Answer

scala.collection.immutable.List

Answer

scala.collection.mutable.List

Answer

java.util.ArrayList

Answer

scala.collection.mutable.Map

Question 3

What does `_` represent when used as a wildcard in Scala imports?

Accepted Answer

Import all members

Answer

Import nothing

Answer

Import only public members

Answer

Import static members

Question 4

How are Scala classes instantiated?

Accepted Answer

new MyClass()

Answer

MyClass.create()

Answer

MyClass.instance()

Answer

MyClass()

Question 5

What is the Scala equivalent of Java's `System.out.println`?

Accepted Answer

println

Answer

Console.log

Answer

print

Answer

System.println

Question 6

Which Scala construct is used to represent optional values and avoid null?

Accepted Answer

Option

Answer

Either

Answer

Try

Answer

Result