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CSE MCQs :: Scala-1

Scala-1 -
  1. How should we end a stream to calculate sum of elements?
    2. A.
    Sink.sum_
    B.
    Sink.fold[Int, Int](0)(_ + _)
    C.
    Sink.sum[Int](_)
    D.
    Sink.map(_ + _)

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  2. What is the advantage of Scala?
    3. A.
    Less error prone functional style
    B.
    High maintainability and productivity
    C.
    High scalability
    D.
    All of these

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  3. What are the Scala variables?
    4. A.
    var myVar : Int=0;
    B.
    val myVal: Int=1;
    C.
    Both A and B
    D.
    None

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  4. When can you use traits?
    5. A.
    If the behaviour will not be reused, then make it a concrete class. Anyhow it is not a reusable behaviour
    B.
    In order to inherit from it in Java code, an abstract class can be used
    C.
    If efficiency is a priority then lean towards using a class
    D.
    All of the above

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  5. Programming language which uses both object-oriented programming and functional programming paradigms is
    6. A.
    Scala
    B.
    Ada
    C.
    Pascal
    D.
    Machine language

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  6. Scala is a short form of
    7. A.
    Scalable language
    B.
    Sequential language
    C.
    Script language
    D.
    Scalar language

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  7. What are the few collections in Scala?
    8. A.
    Array
    B.
    List
    C.
    Sets
    D.
    All of these

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  8. One of the following is an erroneous function definition, can you spot it
    9. A.
    def functionName(x:Int,y:Int):Int=x+y
    B.
    def functionName(x:Int,y:Int):Int={return x+y}
    C.
    def functionName(x:Int,y:Int):Int{x+y} ()
    D.
    def functionName(x:Int,y:Int)={x+y}

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  9. A FUNCTOR must have?
    10. A.
    map function
    B.
    flatMap function
    C.
    map and flatMap both
    D.
    None of the above

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  10. What are three main part of akka streams?
    11. A.
    Source, Flow, Sink
    B.
    Source, Flow, BidirectionalFlow
    C.
    ReactiveStream, Source, Flow
    D.
    Stream, Source, Reactive

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