The line return "" if words.empty? is completely redundant here, as [].join(" ") returns the same thing.

It's a nice touch, but why include it if it essentially does nothing, right?

The following methods were disabled:

Array#count

Array#length

It's disabled and you've been warned in the description.

Can someone explain these exit code issues, even when it passes all tests:

main.rb:10:in `group_and_count': undefined method `each' for nil:NilClass (NoMethodError)
	from main.rb:22:in `<main>'

Does it have to do with the tests that are written for these problems?

Retired.

Using Ruby, it will not use Array#count on arrays. I'm guessing this is using an old Ruby version. Error: Undefined method 'count' for ["a", "b", "b"].

A discussion proposing the retirement of this kata has been opened there: https://github.com/codewars/content-issues/issues/98

Feel free to join it.

The list of disabled methods is incomplete.

This was fixed.

Am I not allowed to use #sort? I got back this message error, test cases were ok!

group_and_count': undefined method sort' for nil:NilClass (NoMethodError)
from `
'
Thanks
Rodolfo

Please, fix a small typo in description: not "and array" but "an array"

I see. Thanks for making it clear. :)