Why kotlin allows to declare variable with the same name as parameter inside the method?

Question

Why kotlin allows to declare variable with the same name as parameter inside the method? And is there any way to access \'hidden\' parameter then?

Example:

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Answer 1

Kotlin does issue a warning about name shadowing which you can suppress with:

@Suppress("NAME_SHADOWING")
val args = Any()

Allowing for such shadowing may be handy in some cases e.g. throwing a custom exception after parameter validation:

fun sample(name: String?) {
    @Suppress("NAME_SHADOWING")
    val name = name ?: throw CustomArgumentRequiredException()
    println(name.length)
}

It is unfortunately not possible to access the shadowed variable.

It is also not possible to turn a warning into an error at the moment.