10786538
Descripción
Test por himanshu arora, actualizado hace más de 1 año
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Creado por himanshu arora
hace alrededor de 7 años
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Pregunta 1
Pregunta
What is NOT necessarily a property of a monoid ?
Respuesta
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Associativity
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Identity
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Functions map & flatMap
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Closure
Pregunta 2
Pregunta
SBT can execute tasks in parallel ?
Respuesta
- True
- False
Pregunta 3
Pregunta
What is the LEAST true statement for an actor akka ?
Respuesta
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Communicates using messages
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Used for concurrency management
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Asynchronous and non-blocking
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Used for parallel programming
Pregunta 4
Pregunta
Future.successful(10)
Future.successful(20)
The above mentioned 2 futures run on two different threads ?
Respuesta
- True
- False
Pregunta 5
Pregunta
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 ?
Respuesta
-
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)
Pregunta 6
Pregunta
case class People(name: String, age: Int)
val people1 = People("Jon", 30)
val people2 = People("Jon", 30)
people1 == people2 ?
Respuesta
- True
- False
Pregunta 7
Pregunta
A FUNCTOR must have ?
Respuesta
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map function
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flatMap function
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map and flatMap both
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none of the above
Pregunta 8
Pregunta
trait F[+A] {
def {...}
}
What does +A represent ?
Respuesta
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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
Pregunta 9
Pregunta
What's a closure ?
Respuesta
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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
Pregunta 10
Pregunta
Which of the following statements about a scala Either are true (multiple responses possible) ?
Respuesta
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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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