Scala quiz 1

Which of the following is true about Scala type inference ?

The data type of the variable has to be mentioned explicitly.

The type of the variable is determined by looking at its value.

Which of the following statements will compile and run

var msg="Testing"
println(msg+" a test")

val msg:String = "Testing"
println(msg+" a horse ");

val msg='Testing'
println(msg=msg+Testing)

var msg="Testing"
println("msg is :"+(msg=msg+" " +msg)

Is having ; ( semi-colon) at the end of the expressions in Scala an error ?

True

False

One of the following is an erroneous function definition, can you spot it

def functionName(x:Int,y:Int):Int=x+y

def functionName(x:Int,y:Int):Int={return x+y}

def functionName(x:Int,y:Int):Int{x+y} ()

def functionName(x:Int,y:Int)={x+y}

The difference between a val and a var is that.

val is a constant

var is a constant

var is a variable

reassigning a value to val is an error

What is the output/error of the following statement ?

val myA= Array(2,3,4)

myA.update(1,5)

myA now contains 2,5,4 ()

its a compilation error at line 2, of the update method's existant

Error as myA can not be updated as it is a val not var

None of the above

What is true about a List and an Array in Scala ?

A List is immutable

A Array is mutable.

You can't add more elements in the list after the list is declared

You can add more elements in the Array even after you declared it

Which of the following is true about Scala language ?

Scala is a statically typed language

Scala is an object oriented language

Scala is a functional programming language

Scala is a dynamic language

Immutable maps are the default maps if no explicit import ?

True

False

Can Scala have static members in its classes ?

Yes