I am struggling to port some older code from a jvm...

# multiplatform

[hallvard]

I am struggling to port some older code from a jvm-only project to combined jvm/js. One of my classes was extending java.util.HashMap, which is now impossible, of course, as the kotlin HashMap is a final class. Seems I have two options: 1) implement Map and add entries(), keys(), size(), containsKey() etc or 2) remove class inheritance and reduce the map to a backing field. Or did I miss something? (Hoping so. Would like to change as little as possible.)

[oshai]

Maybe a class delegation, depends what you want to do

[oshai]

https://kotlinlang.org/docs/reference/delegation.html

[oshai]

Implement map that way

[gildor]

Maybe you could use delegation for this and delegate all calls to MutableMap, so it would be multiplatform solution

[hallvard]

I'm not using delegation, although that wouldn't be all that different. I'll pick up this thread again if I choose to use delegation!