10786538
Description
Quiz by himanshu arora, updated more than 1 year ago
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Created by himanshu arora
over 6 years ago
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Question 1
Question
What is NOT necessarily a property of a monoid ?
Answer
-
Associativity
-
Identity
-
Functions map & flatMap
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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
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mySeqMap = List(How, are, you, doing) mySeqFlatMap = List(Hello, world, doing, soon)
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mySeqMap = List(List(How, are, you, doing)) mySeqFlatMap = List(Hello, world, doing, soon)
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mySeqMap = List(Hello, world, doing, soon) mySeqFlatMap = List(List(How, are, you, doing))
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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
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map and flatMap both
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none of the above
Question 8
Question
trait F[+A] {
def {...}
}
What does +A represent ?
Answer
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Upper bound
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Contravariant type parameter
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Covariant type parameter
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Lower bound
Question 9
Question
What's a closure ?
Answer
-
A function whose return value depends upon a variable declared outside of that function
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A function that takes another function as an argument
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A function that returns a function as argument
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A function that returns a future
Question 10
Question
Which of the following statements about a scala Either are true (multiple responses possible) ?
Answer
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It has two subtypes Left and Right
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Left represents success case and Right represents error case
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Left represents error case and Right represents success case
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Both Left and Right are case classes
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