``` class Dummy { fun foo() = println("Hi") } ...

# announcements

[Vlad]

class Dummy {
    fun foo() = println("Hi")
}
fun Dummy.apply(f :Dummy.() -> Unit) = f()
Dummy().apply({ foo() })

How does Dummy.() -> Unit know how it needs to dispatch the function call?

[edwardwongtl]

Isn’t the f() already means a function call?

[bdawg.io]

It doesn’t know, it just know what’s required and what’s returned by the function call. As @edwardwongtl commented, the f variable has to be invoked to dispatch the function call.