10791648
Beschreibung
Quiz von himanshu arora, aktualisiert more than 1 year ago
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Erstellt von himanshu arora
vor fast 7 Jahre
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Frage 1
Frage
What's a higher order function ?
Antworten
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A function that takes another function as argument
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A function that returns a function
-
Any of the above two
-
None of above
Frage 2
Frage
Which of the following is most adapted for parallel processing ?
Antworten
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Akka Actors
-
Scala Futures
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Scala Options
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Scala Either
Frage 3
Frage
val result = for {
x <- Future(20)
y <- Future(10) if y > 10
} yield x + y
what's the value of result ?
Antworten
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Success(30)
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30
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Failure
Frage 4
Frage
Which one is FALSE about an actor akka ?
Antworten
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Can communicate with an actor using tell function
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Can communicate with an actor using ask pattern
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Messages can be passed to an actor using ActorRef handle of that actor
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Messages can be passed to an actor using Actor instance of that actor
Frage 5
Frage
A monad is a functor which also has a flatMap ?
Antworten
- True
- False
Frage 6
Frage
What's NOT true about a type class in scala ?
Antworten
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It enables ad hoc polymorphism
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It uses implicts, implicitly and bound context syntax
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Addition of a new functionality in type class can be done without any changes to the original code
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Type class is an abstract class
Frage 7
Frage
SBT performs incremental recompilations ?
Antworten
- True
- False
Frage 8
Frage
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 ?
Antworten
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28
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43
-
15
-
None of the above
Frage 9
Frage
trait F[-A] {
}
What does -A represent ?
Antworten
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Covariant type parameter
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Contravariant type parameter
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Lower bound
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Upper bound
Frage 10
Frage
Choose right responses for a partial function (multiple responses possible)
Antworten
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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
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Akka actor's receive method is not an example of partial function
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