How is parameter passing in functions implemented in Kotlin, and what are the features of this process?

In Kotlin, parameters in functions are passed by value, meaning a reference to the object or primitive is copied. Features of parameter passing include:

• Named arguments — you can explicitly specify the parameter name when calling, which improves readability and allows changing the order of arguments.
• Default parameters — you can set default values so they don't need to be passed every time.
• Vararg — allows passing a variable number of arguments of the same type.

Example:

fun greet(name: String = "Guest", vararg messages: String) {
    println("Hello, $name!")
    messages.forEach { println(it) }
}

greet(messages = arrayOf("Welcome", "Glad to see you"))
greet("Ivan", "How are you?", "Have a nice day!")

Also, keep in mind that if a mutable object is passed, changes inside the function will affect the original, as a reference is passed.