Thanks and nice work! All approved.

Well spotted on those plurals! Have added a bit more info for the <3 / non-integer case. Thanks for the feedback, great stuff!

EXCLUDING the the numbers in the test case

watch out for the double "the"!

I'm not sure which word it was precisely but I was able to pass the tests with a code working for 4-or-more-letter "er" ending words and 5-or-more-letter "er" ending words, so maybe a slight tweak in the description to match the tests or vice versa?

And words longer than 4 letters that end in "ER" should have the "ER" trimmed off (the tricky bit is to make sure it can handle commas or spaces)

Also just realised that your test cases pass for words that are 4 letters or longer, should the above only apply to words with 5 or more letters?

tiny error here:

Doulbe "ER"s

Love this idea!

numbers upto n's index

Watch your spacing in the description. Codewars supports Github markdown so you can make your descriptions clearer by wrapping your example code in ```s.

You're quite right, noted and updated. Thanks.

You must concatenate the nth letter from each word to construct a new word which should returned as a string.

Perhaps "You must concatenate the nth letter from each word to construct a new word which should be returned as a string" would be better?

Yes I can see how that might have appeared confusing. Have made the necessary changes. Thanks!

thank you for your kind words!

noted, changes made to the description, thanks!

you learn something new every day in this game!