Is Kotlin a functional language or an object-oriented one?

Does Kotlin fully interoperate with Java?

What will be the output?

val a : String = null
val b : Int? = null
println("$a $b")

What is the difference between a val and a var declaration?

Does Kotlin allow to use of primitive types?

How can we perform a runtime check that identifies whether an object conforms to a String?

What will be the output?

val a : Any = 1
println(a as Long)

What will be the output?

val a : Any = 1
println(a as? Long)

 What’s the difference between a Void and a Unit?

What visibility modifiers are presented in Kotlin?

What is the default visibility used if there is no explicit modifier?

Are private members of an inner class visible to the outer class?

Will the following code compile? If not, then why?

val myInt = 10
var myLong = 22L
myLong = myInt

Which line will be the KotlinNullPointerException thrown in the following code?

val one = null
val two = one!!
val three = two.toUpperCase()

What happens when we compare a null reference with another object?

What is the difference between one and two in the following example?

class SomeClass(val one: String, two: String) {}

What are Varargs in Kotlin?

How many varargs might be placed in a parameter list?

Does the vararg parameter have to be the last one in a parameter list?

Do we have to declare a class as open when it is already declared as abstract?

Can data classes be extended?

Is an anonymous object a singleton?

How can we check if a value is in a range?

What will be the output of the following code?

val a = if (someCondition) {
        12
    }
println(a)

Can try, catch, or finally blocks return a value?