Hello, is it possible to override forEach { } ? When we tried, the IDE at least always redirects to ...

# announcements

[galex]

Hello, is it possible to override forEach { } ? When we tried, the IDE at least always redirects to the stdlib, not to the one we implemented on our class. Weird or expected behavior?

[Milan Hruban]

I don't think you can override extension functions

[adimit]

You can however just not import the extension function. Remove the import statement for your the stdlib forEach then import your own forEach .

[adimit]

Overriding extension functions makes no sense, since they're static, and not actually functions that really belong to the class they're extending. BTW, I might add: defining your own forEach method on, say, List<T> is probably a silly idea. If it does something special, at least reflect that in the name, as people would otherwise be easily confused.

[galex]

I thought local functions have precedence on extension functions, which is why it’s weird. The use case itself makes sense, it’s on some internal class which is a collection which contains in that special case a collection itself. But yeah, I am still surprised by the fact that defining our own forEach didn’t work

[galex]

@adimit I think there was no import, surprisingly. Will check that again.

[gian]

stdlib is imported by default, isn’t it?

[Kroppeb]

If you are "overriding" for a subclass, then it can only call the extension after your type has been (smart)casted to the subtype.
Anyway you could just rename the function forEachRecursive
, or something similar.

[galex]

Yup that’s what we ended doing, renamed it