what's the difference of defining: class MyClass(val a:String, val b:String) from class MyClass(a:String, b:String)

If you use

class Foo(a: String, b: String)

you say that you want the primary constructor to take 2 arguments (a and b). If you add

val

or

var

you also create 2 properties in the class which will automatically get assigned the arguments passed to the constructor.

great that's what I thought as well trying to test it eheheh

they can also use

var

but they should all be properties certainly