10791648
Descripción
Test por himanshu arora, actualizado hace más de 1 año
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Creado por himanshu arora
hace casi 7 años
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Pregunta 1
Pregunta
What's a higher order function ?
Respuesta
-
A function that takes another function as argument
-
A function that returns a function
-
Any of the above two
-
None of above
Pregunta 2
Pregunta
Which of the following is most adapted for parallel processing ?
Respuesta
-
Akka Actors
-
Scala Futures
-
Scala Options
-
Scala Either
Pregunta 3
Pregunta
val result = for {
x <- Future(20)
y <- Future(10) if y > 10
} yield x + y
what's the value of result ?
Respuesta
-
Success(30)
-
30
-
Failure
Pregunta 4
Pregunta
Which one is FALSE about an actor akka ?
Respuesta
-
Can communicate with an actor using tell function
-
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
-
Messages can be passed to an actor using Actor instance of that actor
Pregunta 5
Pregunta
A monad is a functor which also has a flatMap ?
Respuesta
- True
- False
Pregunta 6
Pregunta
What's NOT true about a type class in scala ?
Respuesta
-
It enables ad hoc polymorphism
-
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
-
Type class is an abstract class
Pregunta 7
Pregunta
SBT performs incremental recompilations ?
Respuesta
- True
- False
Pregunta 8
Pregunta
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 ?
Respuesta
-
28
-
43
-
15
-
None of the above
Pregunta 9
Pregunta
trait F[-A] {
}
What does -A represent ?
Respuesta
-
Covariant type parameter
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Contravariant type parameter
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Lower bound
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Upper bound
Pregunta 10
Pregunta
Choose right responses for a partial function (multiple responses possible)
Respuesta
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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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