``` fun counter gt Int var c=0 fun g Int c++ return c return kotlinlang #announcements

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Title

Ifvwm

07/21/2019, 3:08 PM

fun counter():()->Int{
 var c=0
 fun g():Int{
  c++
  return c
 }
 return g
}

why “Function invocation g() expected”?

mbonnin

07/21/2019, 3:09 PM

I guess you need to declare g a val ?

val g: (() -> Int) = {
   c++
   c
}

Dominaezzz

07/21/2019, 3:09 PM

Try

return ::g

Ifvwm

07/21/2019, 3:10 PM

but g is a function, I cannot return a function?

ok, ::g is ok, weird syntax, why it shouldn’t be like return variable?

Dominaezzz

07/21/2019, 3:13 PM

isn't a variable. To return it like a variable you have to do what @mbonnin described.

mbonnin

07/21/2019, 3:13 PM

You need an instance of a function type. It's explained there: https://kotlinlang.org/docs/reference/lambdas.html#instantiating-a-function-type

Ifvwm

07/21/2019, 3:33 PM

val counter:()->()->Int = {
 var c=0
 val g = {
  c++
  c
 }
 g
}

Dominaezzz

07/21/2019, 3:34 PM

val counter:()->()->Int = {
 var c=0
 {
  c++
  c
 }
}

🙂

Ifvwm

07/21/2019, 3:35 PM

wow

Kroppeb

07/21/2019, 6:04 PM

isn't

c++;c

equal to

++c

Dominaezzz

07/21/2019, 6:06 PM

True

val counter:()->()->Int = {
 var c=0
 {
  ++c
 }
}

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