Is there a way in Kotlin to get all arguments of a...

# language-proposals

[Cies Breijs]

Is there a way in Kotlin to get all arguments of a function as a Map<String, Any?>, where the keys are the names of the arguments? If not would this be proposal worthy?

[Joffrey]

Could you describe a use case for this? Why not use a map as input in the first place if you need this?

[Starr]

Are you referring to getting the values passed from inside the function, or getting the parameter types (ie a Map<String, Class<?>>) in a reflection context?
I think the latter can be done atm

A use case I can see for the former is constructing json request bodies -- which I think can be done via replacing the function with a data class with kotlinx.serialization

Using a map as input in the first place would lose type safety...

[jw]

A map also incurs boxing which changes the underlying type, at least on the JVM

[stantronic]

Could this be an extension function to (the up and coming) dataarg classes? It could then live in kotlin.reflect and not add any overhead to modules that dont need it.

[Cies Breijs]

@Joffrey The use case being that I have an API that take a Map of "parameters" and I want to feed it the arguments. I want to add type safety by creating a function for each case.

@Starr I want the values (as values) and the argument names (as keys).

[Starr]

So yeah I'd suggest making a data class instead of a function, and use kotlinx.serialization or something to convert that to a map

[Cies Breijs]

@Starr good tip! Thanks...