Latest Scala Quiz Questions for Beginners & Experience

Select the output for the following line of code:
println(40.getClass)

What will be the output for the following line of code:
println(“frankl”||true))

What is a higher-order function in Scala?

Consider the following list:
var countries=List(“brazil”, “argentina”, “colombia”)
What does the following code do to it?
println{
countries.reduceLeft[String]{(c1: String, c2: String)=>
s”$c1, $c2″
}
}

Now consider this list:
var rrr= List(“ant”, “beer”, “battered”, “cool”, “burger”)
What will this code do to it? Select what it prints.
rrr.filter {(w: String) =>
w.take(1) == “b”
}.reduceLeft{(a: String, b: String) =>
s”$a $b”
}

Select the correct statements about the apply and unapply methods.

What does the following piece of code print?
case class PersonData(name: String, age: Int)
val bob1=new PersonData(“bob”, 99)
val bob2=new PersonData(“bob”, 99)
println(bob1==bob2)

The following statements are true about companion objects and companion classes:

Tell us the output of the following snippet of code:
case class Dog(breed: String, age: Int)
val fido= new Dog(“lab”, 4)
println(fido.toString)

What does this code do?
object DoubleUtils{
implicit class Funny(val num: Double, joke: String){
def knockKnock={
s”${num.toString} is here”
}
}
}
import DoubleUtils._
println(3.14.knockKnock)

Select the correct output:
object Whatever{
def speak(something: String)(implicit nice: String)={
println(s”$something $nice”)
}
}

implicit val nice= “the walrus”
println{
Whatever.speak(“I am”)
}
println{
Whatever.speak(“I like”)(“catfood”)
}

Select the correct statements from the following:

What does the following code print?
trait Diva{
var attitude= “subjective”
}
var arianaGrand= new Diva
println(arianaGrande.attitude)

Slect the correct statements from the following:

Consider the following string.
val s= “(888) 333-4444”
How would you replace all digit with the letter ‘x’?

Which of the following is not a way to make an executable Scala program?

One of the following is not a kind of Scala identifier. Selct the one.

Which of the following is a type of literal in Scala?

Select a regular expression from the options that will parse out the number from the following string: “Milton Friedman died at 94 years of age.”

20 Select the correct statements about Array and ArrayBuffer.

The following code complies:
class Complex(real:Double,imaginary:Double){
def re()=real
def im()=imaginary
}

Does this code compile successfully? Does it print anything?
def sad=”meow”
val catCry=sad
println(catCry())

Select the correct output for the code:
val arr=Array(2,3,4)
arr.update(1,5)

What is the output of the following code?
class User(n:String){
val name:String=n
}
var u=new User(n=”Frankl”)
println(u.name)

What does the variable x hold in the following code:
var x,y,z=(1,2,3)