10791648
Descrição
Quiz por himanshu arora, atualizado more than 1 year ago
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Criado por himanshu arora
aproximadamente 7 anos atrás
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Questão 1
Questão
What's a higher order function ?
Responda
-
A function that takes another function as argument
-
A function that returns a function
-
Any of the above two
-
None of above
Questão 2
Questão
Which of the following is most adapted for parallel processing ?
Responda
-
Akka Actors
-
Scala Futures
-
Scala Options
-
Scala Either
Questão 3
Questão
val result = for {
x <- Future(20)
y <- Future(10) if y > 10
} yield x + y
what's the value of result ?
Responda
-
Success(30)
-
30
-
Failure
Questão 4
Questão
Which one is FALSE about an actor akka ?
Responda
-
Can communicate with an actor using tell function
-
Can communicate with an actor using ask pattern
-
Messages can be passed to an actor using ActorRef handle of that actor
-
Messages can be passed to an actor using Actor instance of that actor
Questão 5
Questão
A monad is a functor which also has a flatMap ?
Responda
- True
- False
Questão 6
Questão
What's NOT true about a type class in scala ?
Responda
-
It enables ad hoc polymorphism
-
It uses implicts, implicitly and bound context syntax
-
Addition of a new functionality in type class can be done without any changes to the original code
-
Type class is an abstract class
Questão 7
Questão
SBT performs incremental recompilations ?
Responda
- True
- False
Questão 8
Questão
val mySeq = Seq("Hello world", "Hello how are you", "Are you well", "Hello guys")
val result = mySeq.flatMap(_.split(" ")).map(_.length).filter(v => v < 4).reduce(_ + _)
What's result ?
Responda
-
28
-
43
-
15
-
None of the above
Questão 9
Questão
trait F[-A] {
}
What does -A represent ?
Responda
-
Covariant type parameter
-
Contravariant type parameter
-
Lower bound
-
Upper bound
Questão 10
Questão
Choose right responses for a partial function (multiple responses possible)
Responda
-
A PartialFunction must provide a method isDefinedAt
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A PartialFunction must provide a method apply
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Can be lifted to a normal function with return type wrapped in an option
-
Akka actor's receive method is not an example of partial function
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