I'm looking at the code that I wrote before. There...

# getting-started

[Konstantin Petrukhnov]

I'm looking at the code that I wrote before. There is cache:
val cache = MutableMap<String, Any?>
where value could be String, Int, Map, Array, etc.
Then i retrieve values from it through the chain of functions, where caller is responsible to specify correct type.
cache[key] as R?
Question: what problems I may get with that approach? All of this code is internal to the module, and run on jvm/ios.

[karelpeeters]

If the user messes up and they don't specify the right type you'll get a classcastexception.

[molikuner]

It would be safer to use: cache[key] as? R?. That way wrong types would be ‘ignored’. The result would be null then.

[karelpeeters]

Except then there's no difference between "not in the cache" and "programmer error"

[Konstantin Petrukhnov]

thx, classcastexception is fine in this case

[karelpeeters]

Although that exception will only occur when the generic code ends, so if for example people just put it in some other generic code the exception might not happen immediately.