I can mutate the value??

# getting-started

[marcelo]

I can mutate the value??

[nfrankel]

the fact that it’s a data class has nothing to do with the fact its properties are mutable or not
from the docs (https://kotlinlang.org/docs/reference/data-classes.html):

All primary constructor parameters need to be marked as val or var

[nfrankel]

data class just means some functions are automatically generated

[nfrankel]

of course, it includes equals() and hashCode()
so you need to figure out how it works with mutability in your case

[nfrankel]

(only properties declared in the constructor are used in function generation
if you move your value to the body, it’s fine

[marcelo]

Thanks Nicolas!