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kotlinlang

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What is the reason that it’s not possible to provide interface function default implementations for `toString()` and alike?
That would be super helpful :slightly_smiling_face:

I would guess because there's already an implementation on Any, so it wouldn't be a default implementation as one already exists on all objects?

True, but the Kotlin compiler could decide to overwrite the implementation of `Any` if that’s supposed to be a feature.

might also be because it's not uncommon for classes to implement multiple interfaces, and the other Any methods (equals, hashcode) usually rely on comparing private state -- actually I'd expect toString to also. dunno why it's actually _prohibited_, though

All functions have the multiple interface problem though - not Any functions :slightly_smiling_face:

I’d find this feature especially useful for inline classes. You cannot use inheritance here and there isn’t much private state.

you couldn't name it toString but you could add an extension method that does what you want

Won’t work with string interpolation unfortunately.