<https://stackoverflow.com/questions/61912898/mutablemap-setvalue-function-no-longer-exist>

# announcements

[elye]

https://stackoverflow.com/questions/61912898/mutablemap-setvalue-function-no-longer-exist

[diesieben07]

Its only available for maps with string keys.
This method specifically exists to allow var foo by <some map value> syntax, you should probably not call it directly. Just use map[key] = value

[elye]

Vielen Dank! Nice one. Didn’t even see that coming. What’s the usage of it if we should never use it?

[diesieben07]

Like I said, it is there to enable property delegation to maps. If you write var foo by map then accessing foo will access map["foo"].
More info on delegation.

[diesieben07]

And specifically: https://kotlinlang.org/docs/reference/delegated-properties.html#storing-properties-in-a-map