Hello, Is there the possibility in Kotlin to retrieve statically the return type or parameters of a...

# getting-started

[Tristan]

Hello,

Is there the possibility in Kotlin to retrieve statically the return type or parameters of a function? In TypeScript it is possible to things like, I don't know about Kotlin.

fun getSomething(): Something {}

val something: ReturnType<typeof getSomething> = getSomething()

It may be useful for situation where:

fun executeSomething(cb: Something.(arg: String) -> Unit) {
    val something = Something()
    something.cb("the arg")
}

// here the type could be different
// val cb: Parameters<executeSomething>[0] = {
val cb: SecretUser.(arg: String) -> Unit = {
    println(propertyOfSomething)
}

executeSomething(cb)

I am just playing with the language 😊

[Landry Norris]

If you are fine with inlining the function, you could use a reified generic. If not, on JVM, the best option I know of is reflection.

[Tristan]

Thank you for answering. I'll take a look at it.