Reducible examples are broken

[chessman]

https://typelevel.org/cats/typeclasses/reducible.html

def countChars(s: String) = s.toCharArray.groupBy(identity).mapValues(_.length)

Reducible[NonEmptyList].nonEmptyTraverse_(NonEmptyList.of("Hello", "World"))(countChars)
// res8: Map[Char, Unit] = Map('l' -> (), 'o' -> ())
Reducible[NonEmptyVector].nonEmptyTraverse_(NonEmptyVector.of("Hello", ""))(countChars)
// res9: Map[Char, Unit] = Map()

I tried to run those examples in Ammonite REPL and got:

cmd1.sc:1: Could not find an instance of Apply for [+V]scala.collection.MapView[Char,V]
val res1 = Reducible[NonEmptyList].nonEmptyTraverse_(NonEmptyList.of("Hello", "World"))(countChars)
                                                                                       ^
Compilation Failed

[LukaJCB]

Good catch! This looks likely to be an issue with the collections api. We should change it from .mapValues(_.length) to .view.mapValues(_.length).toMap

[emilhotkowski]

May I pick this up as my first contribution?

[armanbilge]

@emilhotkowski Thanks for volunteering. Actually, it seems I recently fixed this issue in #4238 without knowing it 😅

Sorry! But I hope you can find another issue to contribute ... if you're having trouble, let me know and we can find you something to work on. Contributions are very appreciated!

[emilhotkowski]

I'm just glad it's fixed. I'll look for another task.