Scala Practice Test | Check Your Scala Knowledge

Select the correct output for the following code:
var band={
var name=”sublime”
name
}
println(name)

Choose the correct output for the following code:
val x:Option[String]=Some(“hi”)
println(x.get)

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

What does this code print?
var y:Option[String]=None
y.get

Is the following function pure?
def change:Unit={
x=x+10
}

Select the correct output for the following code:
object Flash{
def superpower=”speed”
}

Choose the correct output:
object Dog{
def bark=”woof”
}

Select the correct output:
val numbers=List(11,22,33)
var total=0
for(i<-numbers){
total+=i
}
println(total)

Decide what the following code prints:
val odds=List(3,5,7)
var result=1
odds.foreach((num:Int)=>result*=num)
println(result)

Okay, now try to do this one:
val evens=List(2,4,8)
println{
evens.foldLeft(0) { (memo: Int, y: Int) =>
memo+y
}
}

Select appropriate output:
def quadruple(x:Int):Int=x*4
val quadrupleCopy=quadruple _
println(quadrupleCopy(-1))

Which abstraction from functional programming helps us deal with updating complex immutable nested objects?

Choose the correct output:
var greeting:Option[String]= Some(“hello”)
greeting= Some(7)
println(greeting.get)

We do not need to pass these parameters to a method when calling it:

Select the correct output:
val cool=Map(“a”->”aaa”, “b”->”bbb”, “a”->”ccc”)
println(cool(“a”))