Pass by value or by reference in Kotlin: why can't I change a number in a function?

Hello everyone! I just started learning Kotlin after Java and got confused about the mechanism of passing arguments to functions. I read several articles but still don't fully understand. Here's a simple example. I'm writing a function that should increase the passed number by 10: ```kotlin fun increaseValue(x: Int) { x = x + 10 // Compilation error: Val cannot be reassigned } ``` The compiler complains that x is a val. I understand that parameters in Kotlin are immutable references (val). But then how does passing work for mutable objects? Here's another example: ```kotlin data class Person(var name: String) fun changeName(person: Person) { person.name = "New Name" // This works } fun main() { val p = Person("Old") changeName(p) println(p.name) // Prints "New Name" } ``` Here