Hello, I do not understand how to write function with receiver using lambda expression? My example ...

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[Anatoly]

Hello,

I do not understand how to write function with receiver using lambda expression?
My example that doesn't work.

val userRoutes: Route.() -> Unit = { route: Route -> route.userRoutes(userService) }

But this is working:

val tt = { route: Route -> route.userRoutes(userService) }
val userRoutes: Route.() -> Unit = tt

[Sam]

For your first example, you can write:

val userRoutes: Route.() -> Unit = { this.userRoutes(userService) }

Or just

val userRoutes: Route.() -> Unit = { userRoutes(userService) }

[Sam]

The second example works because
> Non-literal values of function types with and without a receiver are interchangeable, so the receiver can stand in for the first parameter, and vice versa.
> https://kotlinlang.org/docs/lambdas.html#instantiating-a-function-type

[Anatoly]

Sam, thanks) You are very helpful)