How are extension functions handled when two of th...

# announcements

[CLOVIS]

How are extension functions handled when two of them are valid?

As an example, I'm thinking of adding Any?.filter, Any?.map etc extension functions, to help with null handling.

How would the compiler react if it is used in a file in which List.filter (from the standard lib) is called? More precisely, if I write the following, which extension function would be called (assuming both are imported):

val l = listOf (...)
l.filter { it... }

In that case they are both valid choices by the compiler, since List is also a Any?. So, which one is called?

[Mike]

Test it? But personally, I hope.the compiler let's you know you have ambiguous definitions. I'd be surprised if it doesn't.