[smichel17]

Kotlin:

    function parseFile(file: File?) {
        val file = file ?: throw Exception("File must exist")
    }

(Not the only way to do it, but in general I really like the language's economics).

[ByteJockey]

I'm pretty sure a function declaration in Kotlin is fun, not function.

[smichel17]

Yes, you're right. I copy-pasted from the previous example on my phone and missed that change.

[ByteJockey]

Happens to everyone.

You have a nice day.