I would make immutable data classes, and use copy:...

# announcements

[marstran]

I would make immutable data classes, and use copy: val newObj = obj1.copy(name = obj2.name, ....).

[qwert_ukg]

i see here is no way to make it, without enumeration of all properties?

[qwert_ukg]

val newObj = obj1.copy(obj2)

[marstran]

You have to enumerate the properties if you only want to copy some of them.

[marstran]

You won't need to copy the object if you want all properties. If the data class immutable that is. In that case, you could just do val newObj = obj2.

[marstran]

By the way, the way you do it with apply is idiomatic when you have a mutable object.