A function whose return value depends upon a variable declared outside of that function

A function that takes another function as an argument

A function that returns a function as argument

A function that returns a future

Scala Quiz - 1

Question 1

Question

What is NOT necessarily a property of a monoid ?

Answer

Associativity
Identity
Functions map & flatMap
Closure

Question 2

Question

SBT can execute tasks in parallel ?

Answer

True
False

Question 3

Question

What is the LEAST true statement for an actor akka ?

Answer

Communicates using messages
Used for concurrency management
Asynchronous and non-blocking
Used for parallel programming

Question 4

Question

Future.successful(10) Future.successful(20) The above mentioned 2 futures run on two different threads ?

Answer

True
False

Question 5

Question

val mySeq = Seq("Hello world", "How are you doing", "See you soon") val mySeqMap = mySeq.map(_.split(" ")).filter(_.length > 3) val mySeqFlatMap = mySeq.flatMap(_.split(" ")).filter(_.length > 3) What are the possible values of mySeqMap and mySeqFlatMap respectively ?

Answer

mySeqMap = List(How, are, you, doing) mySeqFlatMap = List(Hello, world, doing, soon)
mySeqMap = List(List(How, are, you, doing)) mySeqFlatMap = List(Hello, world, doing, soon)
mySeqMap = List(Hello, world, doing, soon) mySeqFlatMap = List(List(How, are, you, doing))
mySeqMap = List(List(How, are, you, doing)) mySeqFlatMap = List(Hello, world, doing, are, you, soon)

Question 6

Question

case class People(name: String, age: Int) val people1 = People("Jon", 30) val people2 = People("Jon", 30) people1 == people2 ?

Answer

True
False

Question 7

Question

A FUNCTOR must have ?

Answer

map function
flatMap function
map and flatMap both
none of the above

Question 8

Question

trait F[+A] { def {...} } What does +A represent ?

Answer

Upper bound
Contravariant type parameter
Covariant type parameter
Lower bound

Question 9

Question

What's a closure ?

Answer

A function whose return value depends upon a variable declared outside of that function
A function that takes another function as an argument
A function that returns a function as argument
A function that returns a future

Question 10

Question

Which of the following statements about a scala Either are true (multiple responses possible) ?

Answer

It has two subtypes Left and Right
Left represents success case and Right represents error case
Left represents error case and Right represents success case
Both Left and Right are case classes

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Scala Quiz - 1

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Question 1

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Question 3

Question 4

Question 5

Question 6

Question 7

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Question 9

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	Created by himanshu arora about 7 years ago