Scala Test 1

Question 1

Which of the following expressions has the proper value?
List(1,2,3)flatMap(x=>List(x,4))

Accepted Answer

List(1,4,2,4,3,4)

Answer

List(1,2,3,4)

Answer

List (1,2,3,x,4)

Answer

List(4,4,4)

Question 2

Scala is also known as:

Accepted Answer

Scripting Language

Answer

Cloud Computing Language

Answer

Style Sheets Language

Answer

None of the above

Question 3

Which of the following claims regarding Either is correct?

Accepted Answer

All of the above

Answer

An instance of Either can be an instance of Left or Right

Answer

It is a sealed abstract class

Answer

We can use it to deal with possible missing values

Question 4

Case classes are Left and Right. Is this statement true or false?

Accepted Answer

True

Answer

False

Question 5

Choose the appropriate value from the following line of code:
"abcde" ensures that (_.length>3)

Accepted Answer

abcde

Answer

the code throws an errorabc

Answer

abc

Answer

abcd

Question 6

Scala is a combination of the words:

Accepted Answer

Scalable and Language

Answer

Sequential and Language

Answer

Scalar and Language

Answer

Script and Language

Question 7

Which of the following claims about a functor in Scala is incorrect?

Accepted Answer

It is a built-in construct in Scala

Answer

It maps objects or entities of one category to those of another

Answer

It is a mapping between categories

Answer

None of the above

Question 8

Which of the following statements about Java and Scala is correct?

Accepted Answer

All of the above

Answer

We can call Scala from Java and Java from Scala

Answer

Both work with popular IDEs like Eclipse, Netbeans, and IntelliJ

Answer

Both run on the JVM

Question 9

In the REPL, how do you halt execution?

Accepted Answer

Pressing Ctrl+C

Answer

Pressing Ctrl+W

Answer

Pressing Ctrl+Q

Answer

None of the above