How comes I can't create an extension function on ...

# announcements

[Gabriel]

How comes I can't create an extension function on Map with multiple signatures? https://pl.kotl.in/i5aSCMMgj but also I can't use Any, Any, so I'm not sure what's the best way to do it?

[Gabriel]

NM I figured it out

fun <T, E> Map<T, E>.toArgString(): String = map { "${it.key}=${it.value}" }.joinToString("&")

[araqnid]

You can annotate extension methods with @JvmName to prevent the method naming clash.
And in this case you can just use Map<*, *>.toArgString() since you don’t really care what T or E are

[araqnid]

Map<String, Any> would work too (or Map<String, Any?>) — the key parameter to Map is invariant, which is why Map<Any,Any> doesn’t work (but Map<*,*> works around that)

[Gabriel]

Thanks @araqnid!