In the meantime you can swap out the interface with a lambda reference (i.e.

public void callingMethod(TestInterface interface)

to

fun callingMethod(lambda: (string) -> String)

Or to keep the naming convention:

fun callingMethod(apply: (String) -> String)

doesn't really work in many cases

If you need some cases that need the

TestInterface

you can keep the original interface method and create a new one that takes a lambda (for those use cases) which then does the conversion to the Interface method (so you only have 1 path)

yup.... saw it in the thread you linked ... and also posted below, with a slight mistake

You’re welcome 🙂