Sorry, me again, hope people don't mind. In the JetBrains tutorial it has the following code

*val* reader = FileReader("test.txt")

reader.*use* {

reader.read()

}

Which can be replaced by

FileReader("test.txt").use { reader -> read("something") }

Which I am confused by, what is "something" referring to?

I think that must be a mistake

Certainly felt like they may be, so what should it be?

You'll probably want to use

reader.read()

as

use

is does not scope

Reader

but passes it as a parameter (which is what the

reader ->

is).

Matthew is right. You should use either of those:

FileReader("test.txt").use { reader -> reader.read() }

FileReader("test.txt").use { it.read() }

Or, with a function reference

FileReader("test.txt").use(Reader::read)

Since

use

passes its receiver as a parameter to the provided lambda, the following two are equivalent:

reader.use { reader.read() }

and

reader.use { it.read() }