Regarding the new 1.4 version: When would one use ...

# announcements

[Orhan Tozan]

Regarding the new 1.4 version:
When would one use fun interface CreateTodoUseCase { fun run() } over interface CreateTodoUseCase { operator fun invoke() } ? I see the latter being used alot for writing UseCases (myself included. Should I switch to functional interfaces instead?

[Michael de Kaste]

Can you provide an example? In our codebase we haven't used either. I'd like to know a usecase for them in general

[Orhan Tozan]

Are you familiar with the UseCase pattern?

[Orhan Tozan]

Common in Clean Architecture

[Michael de Kaste]

Doesn't ring a bell/we don't use it

[Javier]

Why, are you using lambdas with your usecases?

[arekolek]

I don't see fun interface as a replacement for operator fun invoke() 🤔 I'm wondering what would be an example of that

I see fun interface being useful in case some function accepts the interface as argument and you want to make possible to use lambda syntax when calling it:

fun foo(bar: Bar) {
    bar.baz()
}

fun interface Bar {
    fun baz()
}

fun main() {
    foo {
        println("Spam")
    }
}

[Matteo Mirk]

I think the main reason for their introduction is improved interoperability with Java’s SAM.

[Javier]

I think they are different use cases as @arekolek said