what's the difference of defining: class MyClass(v...

# announcements

[coder82]

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

[Burkhard]

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.

[Burkhard]

So class Foo(val a: String) is a short for

class Foo (a: String) {
    val a: String = a
}

[coder82]

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

[coder82]

and that's why data classes can only be with val, makes sense

[phldavies]

they can also use var but they should all be properties certainly

[Shawn]

https://kotlinlang.org/docs/reference/classes.html